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Discussion Starter #1
My wife's SLK230 has developed the dreaded ESP/ABS lights problem,with the car locked in 1st gear :(

Diagnostic codes show a speed sensor issue, reading the live date there's no data from either of the right or left rear wheel speed sensors.

I've checked one, it seems OK and the connector is OK. It seems to me it's extremely unlikely that both fail at exactly the same time so I suspect there's either a connection issue somewhere, or an ESP unit issue.

Questions I hope someone can help with.

1/The ESP wiring diagram shows a connector 'x99/14 'which the legend shows as 'REST[MRA}/BA or ESP intermediate connector'. Where is this located? It has a different pin configuration from the connector on the ESP unit itself, so I'm assuming it's not that one. Both the left and right speed sensor lines pass through it, so that may be the common point of connection loss.

2/ Any other ideas on what could cause loss of data from both wheel speed sensors at the same time?

3/How difficult is it to remove the ESP PCB to check it for connection issues?

The car is 150 miles from the nearest MB dealer with full diagnostics, and I don't feel like driving there in 1st gear!

Any help would be much appreciated.
 

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Sometimes, note sometimes, you can reset limp home mode by simply disconnecting the battery. I think it might depend on the type of fault that put you there though, and you might have to do this several times each time the fault puts you back into it. Worth a try!

As for the PCB, no can help I am afraid!
 

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Thanks, but no, I tried that right in the beginning.

No data from the wheel sensors is a hard fault, not a temporary one., so stays there.
 

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I may be incorrect, but in reading about this problem, it appears that this problem may originate in the brake light switch at the brake pedal.

It's like a $20 part. And replacing it MAY resolve your issues. The wife's car has the same problem, but it has not 'locked up' anything . So I'm having my mechanic replace that switch the next time I take it in for service (oil change) plus I will be replacing all four shocks and the steering stabilizer at that time as well.

We tried the Koni Yellow Sport shocks but even though they are adjustable, they are still too stiff for my wife. So back to factory shocks. As long as we are going that route, I figured we might as well change the steering stabilizer as well.
 
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