Fast Car

How to Replace a Mercedes Mass Air Flow Sensor

1. Disconnect the negative (black) battery cable from the negative terminal on the battery.
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. Unscrew the bolts on the mass air flow sensor using a socket wrench.
4. Remove the screw on the air hose clamps on either side of the mass air flow sensor.
5. Disconnect the hoses and remove the sensor. Replace the old sensor with the new one.
6. Reattach the hoses to the new mass air flow sensor and secure them in place by tightening the screws on the clamps.
7. Bolt the new mass air flow sensor into place.
8. Reattach the wiring harness and reconnect the negative cable to the battery.