Code thrown for fuel trim --bad mas air flow sensor. If I replace MAF with new OEM part, will dealer's computer be necessary to get perameters back into range or after I clear code , will car's computer reset itself properly over period of miles?

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John B

For '95 E320 (W124) it was just a swap and I had to reset the MIL. I'm certain the computer will adjust itself, but I don't know if the MIL resets itself.

Yes the computer is adaptative & will re-learn.... after 5-6 starts with new info the MIL light will stay off.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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Retired Moderator

i got a 1995 c220, and have the same prblem. I checked for leaks,none found.checked fuel pressure, 56-61psi, checked for clogged injectors, fine.do i have to take it to the dealer to reset p0170 code???..i do hear the door actuator pump cycling on and off..