My 1995 E320 read +136 all the time since the day I bought it. I went to a local junkyard, they had only two MB's, both 83 large-body diesels, and cut the sensor off from behind the bumper of one with 236,000 US miles on it, and cut and spliced it on to mine. It works perfectly. The junkyard gave it to me for free. My car had 40,000 miles on it at the time. Why is that sensor from a 1995 vehicle which is 12 years newer and has almost 200,000 miles less junk and the old one is fine? Is this a testament to the rumours about newer Mercedes-Benzes being less quality? I think so.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro