BMW Cars 1999-06

Mass Air Flow (MAF) Sensor 3

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Removal & Installation



3.2L (S52) Engines

CAUTION
Make sure that the ignition is switched off and no electrical equipment is on or running.

  1. Access the fault memory of control unit of Digital Motor Electronics (DME), check for any stored fault messages, rectify those faults and clear the fault memory.
  2.  
  3. Twist and remove connector on the throttle body.

    Click image to see an enlarged view

    Fig. The location of the connector (1) on the throttle body.

  4.  
  5. Unfasten the hose clip and remove the rubber gaiter from throttle body.

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    Fig. The location of the rubber gaiter (2)

  6.  
  7. Loosen clamps on the bellows.
  8.  
  9. Remove air-mass sensor with bellows

    Click image to see an enlarged view

    Fig. Loosen clamps (3 and 4) on the bellows

  10.  
  11. Remove mass airflow sensor from the rubber gaiter.
  12.  

To install:


NOTE
Only reinstall mass air flow sensor with undamaged lattice frame.



Click image to see an enlarged view

Fig. The location of the lattice frame on the mass airflow sensor

  1. Replace the mass airflow sensor into the rubber gaiter.
  2.  
  3. Tighten the clamps.
  4.  
  5. Replace the hose clip and the rubber gaiter onto the throttle body.
  6.  
  7. Install the connector on the throttle body.
  8.  
  9. Check stored fault messages.
  10.  
  11. Rectify faults.
  12.  
  13. Clear the fault memory.
  14.  

Testing



Use a BMW service tester, the OBD I blink code or on OBD II vehicles, use a suitable Data Scan Tool (DST) to check for faults and/or if capable, to read the values of the components. If this diagnostic equipment is not available, proceed as follows.


WARNING
When checking component values (volts or ohms) a suitable digital volt/ohmmeter must be used otherwise the circuit and/or component may be damaged.

 
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