Air Flow Meter/Sensor: Service and Repair

Removing And Installing/Replacing Air-mass Flow Sensor (M54)

Turn off ignition.







Unlock retainers (1) on intake filter housing.
Unlock plug (2) and detach from air-mass flow sensor.
Release hose clip (3).
Detach intake hose (4) from air-mass flow sensor.
Remove air-mass flow sensor.







Installation:
Check seal (1) between air-mass flow sensor and intake filter housing for damage; replace if damaged.
To facilitate joint between air cleaner and throttle assembly, coat gasket with acid-free grease.







Installation:
Only reinstall mass air flow sensor with undamaged lattice frame.


NOTE:
Interrogate fault memory of DME control module.
Check stored fault messages.
Rectify faults.
Then clear fault memory.