How to Replace a Mercedes Mass Air Flow Sensor

Written by aram khayatpour
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How to Replace a Mercedes Mass Air Flow Sensor
The mass air flow sensor is critical to engine performance. (Front-light of black mercedes image by Mladenov from

The mass air flow sensor inside an internal combustion engine monitors the amount of air flow making it through your induction system and into your automobile's combustion chamber. If this part malfunctions, the highly tuned parts of your Mercedes engine may suffer from improper air flow, which could cause increased emissions and permanent damage. Changing the mass air flow sensor takes only a few minutes, but prevents what could be hours of headaches later.

Skill level:

Things you need

  • Socket wrench
  • 10mm socket
  • Phillips screwdriver

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  1. 1

    Disconnect the negative (black) battery cable from the negative terminal on the battery.

  2. 2

    Remove the wiring harness from the mass air flow sensor by pressing in on the tab on the wiring harness and then pulling it out.

  3. 3

    Unscrew the bolts on the mass air flow sensor using a socket wrench.

  4. 4

    Remove the screw on the air hose clamps on either side of the mass air flow sensor.

  5. 5

    Disconnect the hoses and remove the sensor. Replace the old sensor with the new one.

  6. 6

    Reattach the hoses to the new mass air flow sensor and secure them in place by tightening the screws on the clamps.

  7. 7

    Bolt the new mass air flow sensor into place.

  8. 8

    Reattach the wiring harness and reconnect the negative cable to the battery.

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