An air flow meter is an integral part of modern internal combustion engines. An air flow meter measures the amount of air coming into the engine through the intake manifold and converts this volume to grams per second. It then sends this information to the ECU and the ECU then calculates the amount of fuel to be injected into the cylinders. A bad air flow meter could increase fuel consumption, cause stalling issues and in rare cases it could cause a crank no start condition.

The following are steps to diagnose a bad air flow meter and replace it using a BMW E60 with the M54 engine as a case study.

Tools needed

OBD scan tool
Digital multimeter
T30 torx wrench
Screw driver

Connect the car to the OBD scan tool and read the fault codes. In this case we had an air flow meter code and our live data test showed no signal from the air flow meter.

Next thing would be to locate our air flow meter and check the wiring integrity. We do this with a multimeter. We use a multimeter because we need to get the exact voltage signals the computer is sending to the unit and cross check our results with a factory wiring diagram.

Once we have checked and confirmed our wiring integrity to be good we can go ahead and change our sensor. A good sensor can be gotten from chi spare parts. Log on to chispareparts.com.ng or call 08121069256

Our new sensor is installed and we then clear the fault codes. Chi spare parts is Nigeria’s number one auto parts retailer and we give amazing deals on auto parts so dont hesitate to order from us today.

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