mass air flow sensor 25 Answers. Dirty mass air flow sensors don't set diagnostic fault codes. Key on,engine off. The Check Engine light might be turned off automatically in a few cycles of driving with the. Without much thought, Joe made his purchase and headed home to fix his car. com Bought a cheap one off another site check engine light came on. I have a 2003 S10 with a 4. Faulty Mass Air Flow Sensor. My truck has 76k on it and I have already tried changing out the maf sensor. If you own a 1. Your Mazda may be due for an oil change, air filter replacement, spark plug. I pushed throttle in. Replaced it with another new one, not rebuilt. Depending on the make and model, your car uses either a hot-wire airflow meter (the most common) or a hot-film type. Said it was mass air flow sensor. Once the MAFless (SD) VE table is correct and the mass air flow sensor is reconnected, the LTFT’s will go positive. Engine Stalls (Check Engine Light May or May Not Be On) Stalls typically occur when the engine is idling or slowing. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. My check engine light came on about a week ago, went to get it tested came up bad for a Mass Air Flow sensor, ordered the part, replaced it. About 2 months later, the check engine light is on again and it says it is the mass air flow sensor again. Does anyone have any suggestions as to what it can be?. Said it was mass air flow sensor. Service engine soon light came on and stayed on one morning when starting my 1996 Dodge Caravan. Removed thermostat found that it was not closing all the way when cold. The ECU read following: 00258 mass air flow sensor g70 signal too low p0102 lower limit reached. Problems in the EFI can affect other systems, including the catalytic converter, so it's important to fix them right away. When BMW service engine soon light is flashing and car is shaking you have a problem that needs to be addressed as soon as possible. Disconnect the mass air flow sensor, then looking into the harness connector from left to right, check pin #2 for battery voltage. 5 reasons why your 'check engine' light might be on If it's not replaced, gas will evaporate from the car and decrease its gas mileage. Jet Power-Flow Mass Air Sensor How Mass Air Flow Sensors Work. When you fix the problem the light will go out by its Mass Air Flow MAF sensor could be your, problem check that! If the abs and check engine lights are on there is a problem. My O2 sensors and cat had been replaced so I thought I'd give the tuneup a try. To find the correct mass air flow sensor that is guaranteed to fit your car at an unbeatable price, use the Year, Make, and Model search at the top left of this page. My check engine light, oil pressure, & check oil lights have been coming on after warm-up, upon slowing, and under 22rpm, it usually won’t start back up until engine has cooled, either. maf sensor was replaced in 09 cobalt but still not running right and still throws a mass air flow code - Chevrolet 2009 Cobalt question Search Fixya Press enter to search. Mass Air Flow Sensor Products The performance of your vehicle engine relies on one equation: the right amount of fuel + the right amount of air = good engine output. Over time, the sensor gets covered in oil ash and it reduces the sensor's ability to change the oxygen and fuel mixture. I bought a 2004 X3 recently and even though the Check Engine light was not on, I did buy a can of Mass Air Flow sensor cleaner and cleaned the MAF. Some symptoms of a bad mass air flow sensor are due to the sensor being dirty but not defective. These components ECM ( engine control module A and MAFS ( mass air flow sensor) B are integrated on the 'A' Class and therefore a fault developing in one requires them both to be replaced, at considerable cost, £764. Fuel Rail Pressurization: When you first turn the key to the “on” position, the fuel pump will run for 2 seconds pressurizing the fuel rails. -- I keep reading that is a complaint that Nissan is well aware of but has not issued a. P1117 Engine Coolant Temperature Sensor Intermittent. A general inspection and repair of the of the mass air flow. A Mass Air Flow sensor measures the volume of air entering an engine. Checked for vacuum leaks. With Premium Guard air filters, you know you’re getting up to 12,000 miles of engine protection from dust and harmful particles. About 2 months later, the check engine light is on again and it says it is the mass air flow sensor again. The average cost to change Audi Air Mass Sensor at the dealer or auto repair shop is between $180 and $350. If the sensor is reading out of range, check the sensor’s connection to the intake manifold for a possible vacuum leak. 8l, 2004, 110,000 miles new to me Tahoe is the vehicle in question. The Mass Air Flow (MAF sensor circuit is monitored by the Powertrain Control Module (PCM) for an out of range air flow (or voltage) input. How long does it take for the Check Engine light to reset. He told me that replacing the sensor was an option or another avenue was to first try cleaning it to see if the check engine light stayed on after cleaning. What is a Mass Air Flow Sensor? The Mass Air Flow sensor, or MAF sensor, is located in the engine’s air intake. Blown gasket heads. The mass flow sensor and oxygen (O2) sensors are key parts of this system, and a malfunction in either can cause the light to come on. P1101 Mass Air Flow Sensor out of Self-Test Range. It will then relay this information back to the engine control. Many owners confuse the check engine light with the service light, according to Edmunds. Check engine light indicated mass air flow sensor. So you want to be sure of your. The ECU read following: 00258 mass air flow sensor g70 signal too low p0102 lower limit reached. 7:1, so it does some damage to your engine either the ratio is too high or too low. 8l, 2004, 110,000 miles new to me Tahoe is the vehicle in question. Ford Check Engine Light Questions & Answers This page will list all the Check Engine Light questions and answers asked of us pertaining to Ford vehicles. Location of MAF Sensor Mass airflow sensor problems can cause a variety of symptoms from the annoying to the must repair. I recently changed wires and plugs. The Mass Air Flow Sensor sits within your cars air hose and lets the cars computer know how much air is flowing into the engine. He told me that replacing the sensor was an option or another avenue was to first try cleaning it to see if the check engine light stayed on after cleaning. This is an important component of electronic fuel injected engines. Common Toyota Engine Trouble Codes (and What They Mean) When that alarming warning light on your dash illuminates to alert you to "service engine soon" or "check engine", your Toyota is trying to tell you something. If the MAF sensor wire becomes. L-98 Engine Start Sequence. A careful examination of the duct between the air flow sensor and the throttle body should reveal where the unmetered air is entering. P1120 Throttle Position Sensor out of range. I have not had a problem with the truck since the fuel pump was replaced. Your local NAPA AutoCare Center Typically mounted between the air box and the throttle body, the MAF (Mass Air Flow) sensor gets dirty over time. We're going to check for the diagnostic code that we're getting on this Nissan Ultima using the scan tool. Had it replaced, light came back on. If you also notice on your dash, in addition to the activated check engine light, that you have low oil pressure or your Mercedes-Benz is overheating, you should safely pull off the road as soon as you can and shut off the engine. Click for our phone and address information to contact us for your auto repair service. Jet Power-Flow Mass Air Sensor How Mass Air Flow Sensors Work. Mass Airflow Sensors (MAF) report the amount or density (Mass) of the air entering the engine to the Powertrain Control Module (PCM). Faulty Mass Air Flow Sensor. Idle problems seem to go away when maf sensor is disconnected. Went to the dealer for an engine light on. sensors then it had to be the mass air flow sensor, check engine light keeps coming on for bad map sensor but i have replaced it, what could be the problem. The current mechanic did not mention the Check Egine light or computer when talking about the MAF sensor. Air changes its density with temperature and pressure. Oxygen sensors, colloquially known as O2 sensors,. The check engine light comes on when your car’s computer detects an issue within the powertrain. Mass air flow sensor needs to be replaced. The Mass Air Flow Sensor sits within your cars air hose and lets the cars computer know how much air is flowing into the engine. Almost immediately I started getting a check engine light. Re: Mass Air Flow Sensor Replaced - Check engine light still on! « Reply #8 on: January 27, 2016, 05:33:41 PM » A way to reset the entire system is to unhook the battery (negative first, then positive) and leave it unhooked for about 10 min. So I tried some cleaner and reset the. Now they want to charge me $800 more to install a new timing chain because they say this might. Drivers may notice a lack of. Correct air-fuel ratio is so important that all vehicle manufacturers equip their vehicles with parts that will ensure the right ratio. I have a 1999 grand prix gt. P1120 Throttle Position Sensor out of range. -Mass air flow sensor that helps monitor the amount of air that mixes in the fuel injection system could be off. And, as we all know, when you blow on something, it gets cooler. Thus a dirty (contaminated) MAF sensor still creates a signal but it's a MAF signal that. This article applies to the Chevrolet Silverado GMT800 (1999-2006). The sensor is located in the engine's air box, and can be removed with a screwdriver. When you fix the problem the light will go out by its Mass Air Flow MAF sensor could be your, problem check that! If the abs and check engine lights are on there is a problem. new high perfomance mass airflow sensor from granatelli perfromance and now the check engine light is on and will not go off no matter how many times i. the check engine light came on a little bit ago and we got it tested and it was the mass air flow sensor, we recently about 2 weeks ago changed it but the engine light remains on and i know its supposed to take a minute to go out but its been longer now, also every time i get gas (it did this before i changed the MAF as well and was a result of needing to change it) and i turn the car back on. Hot Tip: Work with a cool engine and clear Comments: I changed the mass airflow sensor, but still get the following codes along with rough Sam. A tech can then access that code with a scan tool. com Bought a cheap one off another site check engine light came on. Check Engine Light Diagnostics; Computer Diagnostics (Check Engine Light, Air Bag Light, etc. What is a Mass Air Flow Sensor? The Mass Air Flow sensor, or MAF sensor, is located in the engine’s air intake. With money a bit of a issue I finally got a second sensor and I d/c battery and replaced. If you get any of these codes P0100, P0101, P0102, P0103 and P0104 you most likely need your MAF replaced. The air flow meter uses a flapper vane and temperature sensor to detect the amount and temperature of the incoming air flow. A faulty one can increase emissions, cause the car to stall, and. Air changes its density with temperature and pressure. Bad MAF Sensor– A bad mass air flow sensor can cause the P0171 code to throw, and often does on a Chevy Cruze. We're going to check the mass airflow meter. I took it to Advanced Auto for a ECU read and it said that the MAF sensor was bad. Not sure that is really is the description for P1609, or if its related to the MAF or not. Engine speed (RPM) is also used to determine where on a look up table to determine fuelling, hence speed-density (engine speed / air density). The codes are a P1131 or a P1151, the P1131 is related to B1 S1 (Bank 1 Sensor 1) oxygen sensor which is located near the firewall on the 3. ) Electrical and/or Wiring Problems; Diagnose and repair tire pressure monitoring systems; Warning Light Diagnostics; Overheating Diagnostics. Car idled fine than beep check engine. Mass air flow sensors typically either send a voltage, or frequency signal to the powertrain control module (PCM). This is an important component of electronic fuel injected engines. Reset code and drive vehicle. Best to find a good mechanic one who specializes in engine diagnostics and set an appointment for as soon as possible. 3 When the engine was hunting and surging off St Peter Port I eased back on the throttle, but now realise in that situation more throttle would be better – the same amount of air would leak into the system, but with more fuel being pulled through the proportion of air to fuel would be less and that should keep the engine working. as a matter of fact it seems to get better mileage, I tried everything from the MAF to complete flushes. Replaced ignition coils, mass air flow sensor, oxygen sensor, and spark plugs multiples times to try and fix the check engine light that keeps coming back on. It is important to measure air so that the ECU can calculate the correct amount of fuel to inject into the combustion chamber to achieve the optimum air/fuel ratio. It notably prevents gasoline fumes from leaving the fuel tank, and it helps keep the whole system under the correct pressure. Almost immediately I started getting a check engine light. com Bought a cheap one off another site check engine light came on. Re: Air Flow Sensor I have put a steel plate to block off the EGR valve in 2011. Mass Air Flow Sensor. Many people ignore warning lights if the car still seems to drive the way it used to, however, a check engine light is a red flag that something in your vehicle is amiss. Two days later, the Check Engine Light came back on and after running the diagnosis again, the stupid P01101 MAF sensor code showed up again :( Any Mass Air Flow Sensor code not the problem home | news | features | forums | product reviews | resources | photos | marketplace | contact. Opinions vary on how often you should clean the mass airflow sensor. You may also like. Often this happens when an old or improperly installed air filter allows some unfiltered air into the engine or when oil from an oil-soaked air filter contaminates the air flow sensor. Oxygen sensors, colloquially known as O2 sensors,. Ok,firstly the EGR valve only operates normally under idle and light load/cruise conditions. Re: Mass Air Flow Sensor Replaced - Check engine light still on! « Reply #8 on: January 27, 2016, 05:33:41 PM » A way to reset the entire system is to unhook the battery (negative first, then positive) and leave it unhooked for about 10 min. Hey guys great site glad i found it. Service engine soon light came on and stayed on one morning when starting my 1996 Dodge Caravan. Mass air flow sensor needs to be replaced. MB dealer says need to replace Mass Air Flow Sensor. Remove the small electrical connector jack from the mass air flow sensor. I am thinking of replacing 1 injector at a time to see if it really is a leaky injector, but thought we may find an indication. 66000 mi: Air intake volume check engine light. Well, I am asking what do you look for if the sensor is bad or going bad? My 4. Comments: My engine check light is on. Replace Mass Air Flow (MAF) Sensor Replacing the mass air flow (MAF) sensor is the sixth most common check engine light repair in the U. Once the MAFless (SD) VE table is correct and the mass air flow sensor is reconnected, the LTFT’s will go positive. Exactly when a filter should be replaced depends on the filter manufacturer. Bosch is an original equipment global leader in mass air flow technology. A change in the reading indicates a bad connector, which then has to be replaced. The ECU read following: 00258 mass air flow sensor g70 signal too low p0102 lower limit reached. Mass Air Flow sensor faulty but at the same time my air ratio sensor (O2) went. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. I replaced both oxygen sensors and cleaned the mass air flow sensor but after resetting the codes, the light is still on? All my spark plugs were just replaced including fuel filter. Of course we had to order the part in, so it was Wednesday before my husband could install it, along with a new air filter. When one reads about mass air flow sensor contamination, it is important to recognize that a modern engine can use one of five distinct categories of air measuring devices, each of which works on very different physics principles. Check for air leaks on or around any intake pipework using a good spraying of carb cleaner, if the engine surges then that's the leak. Engine speed (RPM) is also used to determine where on a look up table to determine fuelling, hence speed-density (engine speed / air density). Idle problems seem to go away when maf sensor is disconnected. I just cleaned my mass air flow sensor on my 06 bmw x3 but my service engine light is still on. Does anyone have any suggestions as to what it can be?. Why Your 'Check Engine' Light Is On. If you dont have the 12 volts it is probably a fuse, the 5 volt supply comes from the engine ecu. Moccina 4,595,798 views. Longer will not hurt anything. Mass Airflow Sensors (MAF) report the amount or density (Mass) of the air entering the engine to the Powertrain Control Module (PCM). Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. During the KOEO test the EEC-IV will output codes twice during its display cycle. It is an indication that the PCM is not in complete control of the fuel injection, it's scrambling to make up for an issue that is nearly out of its control. ) Electrical and/or Wiring Problems; Diagnose and repair tire pressure monitoring systems; Warning Light Diagnostics; Overheating Diagnostics. If the MAF is still sending information. If the vehicle utilizes MAF, this condition STRONGLY suggests Mass Air Sensor issues. P0102 Trouble code definition. It is the light that we shouldn’t ignore. Engine speed (RPM) is also used to determine where on a look up table to determine fuelling, hence speed-density (engine speed / air density). Bosch is an original equipment global leader in mass air flow technology. 1- unplugged battery negative 2- replaced maf for a new one (matching part. Because of the number of potential causes, diagnosing a defective mass air flow sensor normally requires the services of an experienced mechanic. He told me that replacing the sensor was an option or another avenue was to first try cleaning it to see if the check engine light stayed on after cleaning. Unmetered air entering the engine means that there is more air than the amount for which the engine is delivering fuel. An engine control unit ( ECU ), also commonly called an engine control module ( ECM ), is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. You may also like. The Mass Air Flow (MAF) Sensor measures the flowrate of air through the air intake before reaching the engine. These components ECM ( engine control module A and MAFS ( mass air flow sensor) B are integrated on the 'A' Class and therefore a fault developing in one requires them both to be replaced, at considerable cost, £764. MB dealer says need to replace Mass Air Flow Sensor. Click for our phone and address information to contact us for your auto repair service. Put in a new air filter. The throttle body controls the air flow into the engine and the fuel injectors supply the proper amount of fuel to each piston depending upon operating conditions. It seems to come and go. Will the check engine light go off by itself it this solves the problem or does the light need to be reset? Is there anything difficult in replacing this sensor? My light came on in october 2007, Mass Air Flow sensor code, cleaned it with no luck. I bought a 2004 X3 recently and even though the Check Engine light was not on, I did buy a can of Mass Air Flow sensor cleaner and cleaned the MAF. Removal was very easy, MAF is located on top of air intake valve behind the air filter housing. Help! ATS Advisor: Unlike GM engines where cleaning the mass air flow sensor will give you results, on Fords you have to replace it if you get this codes. The gasoline engine would start for maybe 10 seconds and shut off. The mass air flow sensor monitors the fuel injection system and how much air is getting into the engine. I don't have much experience with cars, but I thought I might try cleaning it MAF (Mass Air Flow) sensors. The OBD-II code P0101 is set when the signal from the mass air flow sensor is out of expected range, or in other words, the MAF sensor doesn't work properly. If you're local, schedule your next brake or oil change service with us! To schedule an appointment or. If the MAF sensor wire becomes. Most computers know BS from a sensor when they see it. A general inspection and repair of the of the mass air flow. FIXD explains symptoms, causes, and severity of P0101. I have been driving for over a year with this RR and noticed no change in behaviour. Checked for vacuum leaks. If the MAF is still sending information. Inspect the mass air flow sensor/air mass meter wires in a direct light source. So I have a 5. Marking its. However the car cuts off on initial start up and still some what un rsponsive at. Jump to Latest Follow. After changing the mass air flow sensor 2 times I finally got a Nissan Mass Air Flow sensor since the Nissan Dealership told me it had to be the original sensor not aftermarket. Service engine soon light came on and stayed on one morning when starting my 1996 Dodge Caravan. Re: Air Flow Sensor I have put a steel plate to block off the EGR valve in 2011. Code P0101: Mass Air Flow (MAF) Circuit/Performance Malfunction. This prevents the PCM from accurately controlling fuel, which will result in an engine that either will not idle or will idle roughly. We provide free diagnostics with written estimates. Therefore, the ECM must supply more electric current to the hot film as the air flow increases. My check engine light came on about a week ago, went to get it tested came up bad for a Mass Air Flow sensor, ordered the part, replaced it. Had it replaced, light came back on. Seemed to fix. Inspect the mass air flow sensor/air mass meter wires in a direct light source. I turned the car back on and I think it said something on the centre screen but I missed it. upper engine mount seperated 216. 8L equipped Corolla is bad (or not) isn't hard. Step #5: Check the Mass Airflow Sensor Any leakages that can be detected by the air flow sensor should be fixed. The mass air flow sensor is located in the intake tract of the engine, and is connected to a six pin weatherproof connector. Reinstall the mass airflow sensor and clear the check engine light using FIXD. MAP sensor data can be converted to air mass data by using a second variable coming from an IAT Sensor (intake air temperature sensor). Now they want to charge me $800 more to install a new timing chain because they say this might. Unmetered air entering the engine means that there is more air than the amount for which the engine is delivering fuel. Bad MAF Sensor– A bad mass air flow sensor can cause the P0171 code to throw, and often does on a Chevy Cruze. Check Engine Light (CEL) Due to its crucial role in powertrain management expect the CEL to light up after a few driving cycles with a damaged MAF sensor. i had the same problem with my buddy 91. Faulty mass air flow sensor. Drivers may notice a lack of. I also changed the connector for the mass air flow sensor. If you find the air flow sensor cheaper somewhere else, give one of our US based auto specialists a call and we will match that price, 1-888-907-7225. An ACDelco Professional Remanufactured Mass Air Flow (MAF) Sensor is a high quality replacement for many vehicles on the road today. Reset code and drive vehicle. However the car cuts off on initial start up and still some what un rsponsive at. Auto repair shops hate this video. Service engine soon light came on and stayed on one morning when starting my 1996 Dodge Caravan. The mass air flow sensor also sends a command to the vehicle computer, instructing it on how much fuel has to be injected into the engine. Like this comment?. Your oxygen or O2 sensor, measures the amount of unburned oxygen in your vehicle’s exhaust system and when you have a sensor that needs to be replaced, it may cause your check engine light to come to life. Other possibilities include vacuum leak, bad mass air flow sensor, clogged catalytic converter and blown a head gasket. 49300 mi US $30: Check Engine Light P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Verify any dirty build up that would obstruct the engine computer's reading of the air flow. Your vehicle runs on a mixture of gasoline and oxygen and the mass air flow sensor monitors and regulates the air coming into the engine to make sure the mix is correct. MB dealer says need to replace Mass Air Flow Sensor. I recently replaced a bad spark plug, CPU sensor, air filter, cleaned MAF sensor w/ MAF cleaner,used a STP gas treatment. Engine Stalls (Check Engine Light May or May Not Be On) Stalls typically occur when the engine is idling or slowing. A check engine light often comes on due to a dirty airflow sensor (MAS). A proportion of this air flow is ducted off from the main air stream to the side into an aperture in which two wire elements are situated: one is a sensing wire and the other is a compensating wire. Common mass air flow sensors have a very simple design. If the MAF sensor wire becomes. This time they keep my truck for 2 and a half days, ran every test and monitor they had available. Possible causes are A thermistor built into the engine coolant temp. The mass air flow sensor also sends a command to the vehicle computer, instructing it on how much fuel has to be injected into the engine. What could be wrong. The maintenance light is not the same as the check engine light. Not only does it work hard, but it’s. The temperature of the hot film is controlled by the ECM a. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration. What about the engine, could the engine be no good anymore ???. Will this have the IAT built in or will a need a separate IAT sensor? Yalls description is a little confusing. Correct air-fuel ratio is so important that all vehicle manufacturers equip their vehicles with parts that will ensure the right ratio. Malfunctioning mass air flow sensor. It notably prevents gasoline fumes from leaving the fuel tank, and it helps keep the whole system under the correct pressure. Usually, you'll have to put between 50-100 miles on it for the system to reset the light. The check engine light is on and a technician confirm it needs to be replaced and recommended plugs a wires due to misfire(s). Removed thermostat found that it was not closing all the way when cold. Check Engine Light Diagnostics; Computer Diagnostics (Check Engine Light, Air Bag Light, etc. Inside the sensor, there is a thin metal film, which is maintained at a constant temperature via electrical current from the ECM. Mass air flow sensors typically either send a voltage, or frequency signal to the powertrain control module (PCM). The best course of action here is to take. P1116 Engine Coolant Temperature Sensor is out of Self-Test Range. I took it for check up and was told that the mass air flow sensor needs to be changedThis problem is very annoying as it stalls whenever I come to a full stop I have cleaned the MAF and air filter. Even if cleaning the sensor doesn’t solve all your check engine light problems it might not be a waste of time. I am getting a check engine light. Check engine light came on. Mass Air Flow Sensor - Causes, Symptoms, Severity and Estimated Replacement Cost. If you dont have the 12 volts it is probably a fuse, the 5 volt supply comes from the engine ecu. My service advisor at the dealership tells me that O2 sensors are NOT covered under the federally mandated 8 year emissions warranty. We're getting a P0102, and it says MAF or VAF check low input. Inspect the mass air flow sensor/air mass meter wires in a direct light source. The BMW E46 digital engine management (DME) systems use a hot-film mass airflow sensor, installed between the air filter housing and the intake manifold, to monitor air flow into the engine intake. Re: Mass Air Flow Sensor Replaced - Check engine light still on! « Reply #8 on: January 27, 2016, 05:33:41 PM » A way to reset the entire system is to unhook the battery (negative first, then positive) and leave it unhooked for about 10 min. The mass air flow sensor measures the intake flow rate by measuring a part of the entire intake flow. Inaccurate air metering can cause. Short of doing these two things first will result in the check engine light coming back on with the same lean code. A change in the reading indicates a bad connector, which then has to be replaced. The Mass Air Flow (MAF) sensor is placed in the stream of intake air. This automotive repair blog covers a couple of common fault codes that sets the SES (Service Engine Soon) or CEL (Check Engine Light) whichever term you prefer to use. It cost me $604. Can anyone tell me how much I should expect to pay for the part and if I take it to the dealer for replacement, what the cost should run. 8L equipped Corolla is bad (or not) isn't hard. mass air flow sensor 25 Answers. A problem with the mass air flow sensor often causes the "check engine" or "service engine soon" light in the vehicle instrument panel to illuminate. Once you've replaced your vehicle's O2 sensor, you'll need to reset the ECU so it can properly gather information from the new O2 sensor. This sensor is responsible for supplying the right quantity of air to Note: Don't be surprised if the Check Engine Light is still on even after tightening a loose gas cap. This sensor is responsible for supplying the right quantity of air to Note: Don't be surprised if the Check Engine Light is still on even after tightening a loose gas cap. I recently changed wires and plugs. If you dont have the 12 volts it is probably a fuse, the 5 volt supply comes from the engine ecu. This is called the speed-density method. and it first came up at autozone as the TPS sensor so i changed that, and it still did it, so i took it to a shop and their test said TPS sensor still and clock spring. P1117 Engine Coolant Temperature Sensor Intermittent. Changed it with used one same symptoms, bought a new one and put it on same thing. Q: Check engine light still on after cleaning mass airflow sensor. A faulty mass air flow sensor may also have similar symptoms to low fuel pressure, which indicates a bad fuel pump. However the car cuts off on initial start up and still some what un rsponsive at. A check engine light does not mean any specific one thing is occurring. I checked for leaks using propane. If there’s no leak, the sensor needs to be replaced. The average cost to change Audi Air Mass Sensor at the dealer or auto repair shop is between $180 and $350. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. 7:1, so it does some damage to your engine either the ratio is too high or too low. I recently replaced a bad spark plug, CPU sensor, air filter, cleaned MAF sensor w/ MAF cleaner,used a STP gas treatment. Ouch! The check engine light did go off. It looks like a small square with 2 screws on the top of air intake with 5 wires attached to on. Not only can a contaminated mass airflow sensor cause hesitation and stalling, but it can also cause poor fuel economy and performance. Auto repair shops hate this video. the computer, reconnected it, started the car, and the check engine light is still onGRRRR!!! anyone with other ideas?. It cost me $604. I have driven the car for another few days and it does seem. My check engine light came on about a week ago, went to get it tested came up bad for a Mass Air Flow sensor, ordered the part, replaced it. In this tutorial, I'm gonna' show you how to do it with just a multimeter and in step-by-step manner. Failing mass air flow sensor. After changing same, the engine kept dying for 10 miles, then runs good now. The Mass Air Flow ( MAF) sensor is placed in the stream of intake air. Best to find a good mechanic one who specializes in engine diagnostics and set an appointment for as soon as possible. - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection What does this mean? If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America). Check Engine Light after New MAF Sensor Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s.