In my '92 500E both of these warning lights came on when I was coming to a stop today(not a hard stop) and stayed on until I shut off the engine. The next time I started the engine they were off and have not come back on. This has happened two times before over the last 3 months.

Any suggestions on what I should be looking for?

Thanks!

The car you have has smart computers, so take car to MB service center where there is a scan tool that can read the recorded fault(s) in the ABS/ASR computer. Sounds like a bad front ABS sensor.

Mine did something similar when it was suffering from the W124 cracked wiring harness issue. The throttle computer and whatnot went into "limp mode" at the same time. Notice yours doing that or just the lights? Either way, you still should take the "DOC's" advice and see a dealer or independent that is familiar with a scan tool.

Hope this helps...Lee

Hi All,

Have just encountered the same ASR-ABS problem noted by Mark, except that the problem has progressed such that on some days, the light is on all the time, while on others, it is off. Interestingly, when the lights are on (they are always paired), the car does NOT enter limp mode, which has underscored the merits of a defeated ASR...

Took the car to an authorized dealer. It is not the wiring harness. They changed a switch (neutral switch? Can't recall the name of it), but that didn't work, and apparently the sensors are OK. They still can't find the problem but would like to change-out the pump controller for an obscene amount!!!

Any thoughts on this?

Many thanks!

'92 500E

Also don't forget the old brake lamp switch. They will cause this as well.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

I've seen at least 10 items cause this type of complaint. Did the dealer give you a print out of all codes retrieved from the computers. There are at least 3 computers that should given them some idea of the problem. Many times the problem comes from a "weak" throttle return spring or defective brake switch. The throttle actuator is also a common HIGH $$$$ part that will cause this problem. Ask them to cough up the codes that were found & then a better diagnosis can be surmised!

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. TECH
190E 2.3 ITS RACECAR

Thanks, Georgians!

I did ask about the codes the first time it went in, and there were perhaps 11 faults reported that they checked. This led to replacing that switch. On the most recent visit, they reported NO faults, despite the intermittant presence of the lights (it's wierd, some days nothing, the next day on from the start). I'll try speaking with the mechanic who did the work (rather than the manager).

Hope you all get thru the storms OK; Atlanta looks ugly.


Thanks again!

Everyone stayed home today!! But we still have the Super Bowl this weekend! Really the accel cable returning properly is very important!

Alas, neither brake lamp switch nor throttle adjustment fixed the problem. The error code (I'm told) indicates the solenoid. The authorized Mercedes repair shop still wants to replace the entire unit (a box-like device on the driver's side of the engine compartment). Is replacement the only fix? I'll need a loan to get this done!!

Thanks again!

I have also been suffering these problems on my '94 E420 for sometime now. SRS light on for no reason, Idle speed jumping up and down, no throttle response when I need it most. LOOK OUT FOR THAT TRAIN!! Lastnight I got fed up with it and decided check all grounds I could get to. What I found was all the wires that run in a plastic channel along the top of the fuel rail were cracked. Easy fix as soon as I can get my hands on a new harness. Does MercedesShop.com carry these harnesses? It's the one that runs from a clamp down coupling behind the battery size computer housing through the secondary firewall to the injectors, idle speed accuator, coolant sensor and various sensors atop the engine. I hope replacing this will solve all these problems.

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John Kurtz
Art Director
AGENCY.COM
P.O Box 3600
37347 U.S 6, Suite 110
Avon, CO 81620
970.845.2118
jkurtz@agency.com



[This message has been edited by jkurtz (edited 02-06-2000).]

The problem with the engine wiring harness is a common problem on 93-95 cars. Many times Mercedes will "goodwill" warranty these harnesses. Take a look at the pro's tech tips.


Back to the 92 500E, I've never seen the Computer cause these problems. The throttle actuator can & does cause this problem frequently.

Well, I'm 99.99% sure it's the harness. After examining and putting back together the harness and the plastic shield that protects it, the car hardly runs. It acts as if it's running one piston. Does anyone have a line a where to get a new harness? Someone other than MB, just to have options.

------------------
John Kurtz
Art Director
AGENCY.COM
P.O Box 3600
37347 U.S 6, Suite 110
Avon, CO 81620
970.845.2118
jkurtz@agency.com