Mass airflow sensor replacement cost11/7/2023 ![]() Hesitation, rough or jerky accelerationĪs you may suspect, a faulty fuel injection caused by a poor MAF sensor can also make your acceleration rough or jerky. RELATED: Car Losing Power When Accelerating? (Here’re the Causes) 3. If you notice that your car is much slower than usual, there is a significant risk that your MAF sensor is at fault. Slow acceleration is one such possibility. A faulty MAF sensor can cause a faulty air-fuel mixture, which can cause many strange performance issues with your car. Your engine needs a perfect air-fuel mixture in the combustion chamber for optimal performance. If your check engine light is illuminated, you will want to check the diagnostic trouble codes first with an OBD2 scanner. However, the engine control module does not always recognize a faulty MAF sensor, so it may still be defective, even if there is no engine light on your dashboard. A check engine light is one of the most common bad mass air flow sensor symptoms. Therefore, if your MAF sensor is faulty and sends wrong information to the engine control unit, the check engine light will illuminate your dashboard. If a sensor sends an incorrect signal, the ECM or PCM will turn on the check engine indicator light. ![]() It’s also worth noting that trying to clean a MAF sensor with something other than a sensor-specific cleaner can damage the electronics.The engine control module monitors all sensors in the car engine to ensure that everything is OK. Water in the intake can also damage the sensor, though most of the time it can be dried. But in some cases, the element itself or the electronics in the sensor can be at fault, or the contamination can’t be cleared and the sensor needs to be replaced.Īnother problem that happens sometimes in winter is that a vehicle that gets into too much water can suck water into the intake and foul the MAF sensor, leading to poor running. There are cleaners that are made specifically for the delicate MAF sensors, which are worth a try and often work to improve things. Or an engine light on and a “lean mixture” warning. Signs of that are low power, poor mileage, white deposits on the spark plugs, and exhaust valves. If the element is blocked at all it won’t register the correct amount of air, almost always underestimating, and the engine will run lean. The main common problem is dust or oil or any kind of contamination fouls the MAF sensor element. Unless it should be added, a different system entirely is used some engine management systems (a minority) rely on a manifold pressure sensor and throttle position data rather than a MAF sensor to calculate airflow and determine fuel mixture. The two primary parts of a modern engine management system as far as efficient running is the MAF sensor and the O2 sensors. Knowing the mass and the temperature of the air coming in allows the PCM to calculate the amount of fuel necessary for a correct mixture.Īfter the fuel mixture is calculated using MAF sensor data and combustion occurs, the O2 sensor on the exhaust side double-checks the results, and the mixture is fine-tuned based on that. An air temperature sensor is also incorporated into the MAF sensor. But those are just two different strategies of arriving at the same information, which is the amount of air entering the engine. There are two different types of this sensor, one a “hot wire” sensor, the other a “vane-meter” sensor. A mass airflow sensor (MAF for short) sits in the vehicle’s air intake and measures the mass of the air flowing into the engine.
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