2004 E55 Mass Air Flow Sensor (MAF)

[esgee]

There may be posts on this elsewhere...sorry if this is a duplicate.

I have a 2004 e55 that just recently had the "check engine" light come on (49,805 miles). I've read a bunch of articles since then and, without a proper diagnostic, think it may be the mass air flow sensor. Symptoms are, sporadic loss of power and the car stalled once at a stop...the dealer says that the MAF is around $780 and it's $140 for a diagnostic that will be applied to the price of repair if I proceed. I'm ordering new air filters now and am about to go to the second tank of gas since the light came on.

Does anyone have experience with the MAF replacement on this engine? Thoughts?

[DesertMotorWorks]

Originally Posted by esgee

There may be posts on this elsewhere...sorry if this is a duplicate.

I have a 2004 e55 that just recently had the "check engine" light come on (49,805 miles). I've read a bunch of articles since then and, without a proper diagnostic, think it may be the mass air flow sensor. Symptoms are, sporadic loss of power and the car stalled once at a stop...the dealer says that the MAF is around $780 and it's $140 for a diagnostic that will be applied to the price of repair if I proceed. I'm ordering new air filters now and am about to go to the second tank of gas since the light came on.

Does anyone have experience with the MAF replacement on this engine? Thoughts?

A full diagnostic scan should be done (either at the dealership, or an independent MB shop with the proper equipment).

Your symptoms could be due to:

-MAF
-Camshaft Position Sensor
-Vacuum leak
-Fuel Pump and/or Filter

Try going to AutoZone, and see if they can pull codes for you (free service).

[bobgodd]

Actually, your 2004 doesn't have a MAF sensor.... Were you thinking about the MAP sensor?

MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor

[str8ridin]

And you dealer should know you don't have a MAF. You should tell them to go ahead and do the work, and if they charge you for a MAF, sue their ass! :-)

[Fast55]

Originally Posted by bobgodd

Actually, your 2004 doesn't have a MAF sensor.... Were you thinking about the MAP sensor?

MAF = Mass Air Flow Sensor
MAP = Manifold Absolute Pressure Sensor

Correst, and the MAP sensor is not all that expensive.