E36M3toS4

Has anyone else experienced MAF failure? Mine has failed twice and the car diverts to "limp" mode.

Milpitas2.7T

interesting... MarK P? maybe other wise no other hitachi failures

Mat Indukts Lambos

It had an obvious CELO, but it was for misfires on cylinder 4,5 & 6, and there was also a fault for EGT sensors. Monitoring the EGT's, they're supposed to be either 945 or 1045, but the drivers side one was registering all sorts of different #'s. Turns out, the MAF, EGT sensors, and a few other things are all on the same reference voltage source. When the hitachi MAF glitched, it affected the EGT sensor, and created a downward spiral. Had it been left alone, other dtc's would've also been generated, and it could really send a tech on a wild goose chase!

Now, who's car was that? ;-P

Milpitas2.7T

Hmm i had 2 bad EGT sensors based on DTC's those were replaced, MAF left alone, car feels fine

dscottjr

eed density. Is it normal for Hitachi MAF failures to lead to limp?? I know there haven't been a lot of Hitachi failures so I wonder?

Dan ex S4 owner

Mat's referring to my car. No limp mode though. Just didn't run well at high loads.