Mass Air Flow Sensor (MAF) Problems & Common Fault Symptoms

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.
6 Symptoms of Mass Air Flow Sensor (MAF) Problems
The Latest Owner Problems

We have 173 owner submitted problems mentioning the Mass Air Flow Sensor (MAF) - see more problems .

7
responses
Starting problems

takes 4 or 5 attempts to start once started loud knocking sound

2011 Ford S-Max 2.0tdci
Posted: Jan 7, 2021
1
response
Engine surges

in all gears at all speeds then car seems to surge lacks power for a couple of seconds then picks up then surges again

2005 Ford Fiesta 1600 ghia
Posted: Jan 6, 2021
5
responses
Engine cuts out at 3000 rpm and also trys to cut out while driving along

Cuts out while on tick over, while driving along and will cut out at 3000 rpm

2007 Vauxhall Combo 1.7 cdti
Posted: Dec 18, 2020
9
responses
Ignition coil

Hi i have bought a new coil ignition but the engine light keeps coming back , is it because I didn't change the ignition...

2009 Ford Fiesta 1.4
Posted: Dec 18, 2020
12
responses
Electrical problems

yesterday the airbag light turned on, and the heater fan will not start, the headlights will not switch to full and I ca...

2009 Ford Mondeo 2.0TDI
Posted: Nov 24, 2020
3
responses
No dashboard indication and central locking not working

Central locking not working on the remote . No dashboard information at all and radio stays on when ignition is turned o...

2009 Ford Mondeo 1.6
Posted: Nov 11, 2020
2
responses
Running rough.

The engine runs really rough. If I accelerate normally the engine judders, especially at lower revs If I accelerate har...

2006 Ford S-Max 2.0 Desiel
Posted: Oct 6, 2020
1
response
Engine juddering while accelerating

My corsa is not accelerating properly the engine judders for a few seconds then its fine it happens quite a lot until im...

2016 Vauxhall Corsa 1.4 limited edition
Posted: Sep 7, 2020
3
responses
Loses power and cuts out

loses power put your foot down and it struggles to pick up then cuts out, start again but struggles to go its as if the...

2011 Ford Mondeo 2.0l estate
Posted: Aug 19, 2020
2
responses
Engine cuts out sometimes when stopping

engine cuts out only when stopping or sometimes at traffic lights

2012 Ford Focus 1.6 125bhp
Posted: Aug 16, 2020
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