W140 ASR limp mode
Thread Starter
Newbie
Joined: Jul 2019
Posts: 1
Likes: 0
From: Tennessee
1995 S420 2011 C300
W140 ASR limp mode
Hello everyone, so here is the deal on my 95 S420 which has had the wiring harness replaced is going into the limp mode still......where else should i be looking this is very frustrating I'm about ready to sell a lot of money has been spent so far other than this it runs perfectly . Is there anything else that could trigger this??
Junior Member
Joined: Oct 2019
Posts: 15
Likes: 3
1992 500sel
Sorry to jump in but I suffer from the same thing. Im pin pointing it to either the throttlebody or the MAF at this point. My question hasn't been answered either. But If I find any more info ill report back
Junior Member
Joined: Oct 2019
Posts: 22
Likes: 1
From: Tn
2011 C300. 1995 S420
I’m glad you jumped in interesting thing is the upper and lower harness has been changed, MAS has been replaced as well as the throttle body, just wondering what else oh and I have changed the fuses in the coffin..
Junior Member
Joined: Oct 2019
Posts: 15
Likes: 3
1992 500sel
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Junior Member
Joined: Aug 2019
Posts: 28
Likes: 4
From: Cape Town South Africa
W210
There is such alot that can cause a limp mode. Ask me, i know lol, stil lgot it. Anyway, low battery voltage, brake light switch, speed sensor, faulty accelerator pedal sensor or a bad transmission module. In my case it was a faulty transmission module, cause by oil going into the module. Your best bet is to have is scanned with a proper tool. Or else you going to be chasing your tail
Newbie
Joined: Feb 2020
Posts: 4
Likes: 1
1995 S420
I may have a solution
Hello everyone, so here is the deal on my 95 S420 which has had the wiring harness replaced is going into the limp mode still......where else should i be looking this is very frustrating I'm about ready to sell a lot of money has been spent so far other than this it runs perfectly . Is there anything else that could trigger this??
Last edited by Ken Taub; Feb 11, 2020 at 08:42 PM.
Newbie
Joined: Feb 2020
Posts: 4
Likes: 1
1995 S420
Interior, under the right side dashboard, reached from under the dash. Sorry I can’t be more specific, but I wasn’t there when they did the switch. I was shown the old part, which is a small, fairly flat, plastic box. It is riveted closed. My mechanic popped the rivets and cleaned the internals of the part, re-installed it, and ran it for some time without going into limp mode. Then he replaced the part with a new one; just under $100, I think, but don’t hold me to it. Labor to diagnose was the bigger cost, but not crazy. That was in March of 2017. A couple of days later, we set off on an 11,000 mile cross country trip without being sure if it was fixed. I got more confident the longer I drove it. Never went into limp mode again.
BTW, before the repair, the car started and ran perfectly otherwise. My throttle body and harness had evidently been replaced before I bought it, and MB dealer I paid $200 for a diagnosis wanted to replace my throttle body (again, I guess) without guaranteeing it would solve my problem. Before the repair, it got to where I could get it to go into limp mode by accelerating hard, but it would also do it without slamming on the pedal. It got to where I could put the car in neutral, shut it off, and restart it all in the time it took my speed to drop from 70 to 50mph.
BTW, before the repair, the car started and ran perfectly otherwise. My throttle body and harness had evidently been replaced before I bought it, and MB dealer I paid $200 for a diagnosis wanted to replace my throttle body (again, I guess) without guaranteeing it would solve my problem. Before the repair, it got to where I could get it to go into limp mode by accelerating hard, but it would also do it without slamming on the pedal. It got to where I could put the car in neutral, shut it off, and restart it all in the time it took my speed to drop from 70 to 50mph.
Last edited by Ken Taub; Feb 11, 2020 at 08:51 PM.
Newbie
Joined: Feb 2020
Posts: 4
Likes: 1
1995 S420
I have had no transmission work nor have I changed the fluid. The only other unexpected repair was to replace a clogged catalytic converter when I first got the car.
Newbie
Joined: Jan 2022
Posts: 1
Likes: 0
S420
I have a 95 S420 with ASR as well. I start the car and the light is off. As soon as I accelerate, it jerks and then ASR light comes on. I haven't checked the CEL but is this how others ASR is as well?
Hello everyone, so here is the deal on my 95 S420 which has had the wiring harness replaced is going into the limp mode still......where else should i be looking this is very frustrating I'm about ready to sell a lot of money has been spent so far other than this it runs perfectly . Is there anything else that could trigger this??
