I just bought a 1992 500SL which worked great during the test drive. Now that I own it, the ASR light comes on, it goes into limp mode and the engine will stall.
I've read the treads, trying to narrow the problem down. One sympton is that it may only be occurring when the car is driven at low speeds, such as in traffic. If I can be aggressive with the throttle, no problem.
The other feature to my problem is the fact it stalls. As the dealer pointed out, that shouldn't happen in the limp home mode as it would be a saftey problem.
The car is now at the dealer, he has not found any codes. He's searching.
Anyone have any good ideas of where to look first?
Jim

Do a search on "asr light" and you'll see a lot of posts on this.

Mine was caused by a faulty brake light switch.

Wonder why no codes were set? I understand that some malfunctions have to occur 3 times before a code is set, but I wouldn't expect that from a problem like an ASR system malfunction complete with limp-home mode.

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Steve
'93 400E

I've had the light come on many times, one would have thought it would have set a code but they report it hasn't. Without the code, they seem to be lost.

You want to get a code as soon as the thing craps on you.
Intermittent ASR are usually brake switch , but by the time you get to the scanner , it has erased.
The car has Flash code retrieve and you can make a simple tool to get the codes yourself from the EA module [ this is where you will find an ASR code on 129.066]
Do a "code tool" search . The EA access on that car are at pins 1 and 3 for power and pin 7 for EA/CC /ASR codes.

Thanks. The dealer said he'll spend up to $500 in time looking.
If he fails to find it, I'll do what you said rather than spend more time for him to search.

Arthur,
I could swear I read that once a code is set, it's only erased after a rather large number of normal start cycles have elapsed -- like 100? Not true for ASR fault codes?

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Steve
'93 400E