The dealer wanted $199.00 for a new ambient temp sensor, which controls the outside temp reading on the dash. I bought it online for $60.00(MB part). I have found one end on the bumper grill and am having trouble tracing it to the other end. Has anone replaced this themselves, or is this a dealer job? Any tips would be appreciated.
THanks!

My car is a 1992 300sd (140 body)
Thanks

This thread may help:

87 300e outside temp gage

The temp sensor cable is made into the body wiring harness on a 140 chassis car. The sensor is mounted to the tow hook cover on the left side of the front bumper, from there it goes up beside the a/c drier area and then into the main wiring harness all the way to the back of the instrument cluster. You have two choices for repair, you can either cut the old sensor end off and solder and heat shrink the new sensor on, or you can route the new sensor cable into the cluster. I have done it both ways and attaching the new sensor probe to the old cable is by far much easier than routing the cable into the car. Just cut and splice the cable a foot or so from the sensor probe end and use solder and heat shrink tubing for a good repair. I have done several this way with no problems at all.

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Mercedes Benz Master Tech - Retired

I'll definately try to spice the new sensor to the old wire.
Thanks for sharing your expertise.