Mass Air Flow Sensor (MAF)

The Mass Air Flow Sensor (MAF) measures the levels of air entering the engine through the intake system. The readings from the sensor are passed to the ECU (Engine Control Unit aka the car's brain!). The ECU will use this information so that it can calibrate the amount of fuel that it needs to inject via the fuel injectors.

The fuel/air levels are constantly tweaked by the ECU based on the input from the MAF sensor. If for some reason the MAF sensor is not sending the correct readings then the engine will behave erratically as it will be operating with an incorrect fuel / air mix.

MAF sensors are prone to error when they get dirty. As a car ages there can be a build up on the sensor which can degrade its performance and affect the data it sends to the ECU. The sensor can be cleaned (quite often as a DIY job) to improve accuracy but sometimes they also fail and need replacing.

• Engine doesn't start up and/or cuts out when running
• Engine is misfiring
• Engine does not sound or feel normal
• Check Engine warning light showing on dashboard
• Engine is running rough
• Fuel consumption seems above normal range

Engine juddering while accelerating
Vauxhall Corsa

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Loses power and cuts out
Ford Mondeo

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Engine cuts out sometimes when stopping
Ford Focus

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ENGINE FAULT DIAGNOSED MAF SENSOR FAULT CHANGED SENSOR STILL SHOWING FAULT
Nissan Elgrand

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High revs
Nissan Elgrand

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Starts fine from cold if turned off and started again will only reach 3000 revs andsounds like the choke is on
Nissan Micra

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Car revs drop to 300revs then pops
Suzuki Vitara

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Throttle not revving engine
Vauxhall Combo

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MAP sensor or not
Vauxhall Zafira

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Starting problem
Vauxhall Zafira

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