Installation and fault finding

EMS Caution UK

 Removal and installation

  1. Disconnect the MAF Sensor connector. Remove the screws and plug-in type MAF Sensor. If MAF Sensor has a suction pipe, loosen the pipe clamps that locate the MAF Sensor into the air intake duct and remove the MAF Sensor
  2. Install the new MAF Sensor with the screws into the air intake duct and connect the MAF connector. If the MAF Sensor has a suction pipe, tighten all pipe clamps. Turn the engine on and check if the intake system works properly
  3. Check the entire air intake system for leaks and make sure that the O-ring is not cracked or jammed when installing it
MAFS Caution UK

Fault finding

Possible failures 

MAF Sensor contamination or damage is usually caused by an Air Filter that is in poor condition or incorrectly installed. A damaged or contaminated MAF Sensor can still function, but the changes to its characteristics can cause a wide variety of driving problems.

  • Poor startup: First combustion occurs, but combustion is incomplete.
  • Instability at idling: High idle speed, low idle speed or unstable idle.
  • Poor drivability: Hesitation during acceleration, engine backfires, abnormal knocking or black smoke emitted.
  • Stalling: Shortly after startup, when accelerator is depressed or released.
Prevention and Solutions 

A problem with the MAF Sensor can cause the engine warning light to turn on. This fault is stored as a diagnostic trouble code (DTC) in the engine ECU and can be inspected by a DTC scan tool. However, if the root cause of failure is a clogged MAF Sensor passage, the engine will usually start, will run poorly or stall, and may not set a DTC.  If the MAF Sensor is defective, it will need to be replaced. This is a very simple process. If the MAF Sensor is contaminated, cleaning it may provide a temporary solution; but this may damage the Sensor’s delicate hardware. If the MAF Sensor is replaced, make sure the air filter is also installed properly.