Hope someone can help. I have a 2004 300M Special that runs perfect 99% of the time. The other 1% is baffling to me and to the local dealer too. What's happening is the Service Eng. Soon light will come on while the car is running perfectly. It will then either stall out or start vibrating tremendously between 20 and 30 MPH. Once you turn the car off, the problem goes away. The SES light stays on for a few cycles then goes off. The dealer won't even look at it because he says if the car is not malfunctioning, the SES light code means nothing to him. So either I get the car to him while it's acting up (next to impossible as the car typically won't go bad while the dealership is open, plus now it's stalling instead of vibrating and bucking) or he says he can't help me. I'm pretty sure I'm heading for a major problem. Anyone ever heard of anything like this? Thanks in advance.

 

well that sucks i can tell ya that much we hear that alot at the dealer though and for the most part they are correct but their is a tsb that kinda describes the issue except it says at like 47mph and built before april of 2003 its tsb 09-002-03 other then that i hope you can catch it when its happening and git it in their the computer should keep the code in the computer but if you can when it happens
good luck sorry to hear your 2004 is acting up like that