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Originally Posted by RandallNeighbour
Not to knock LB's answer, but I've got a 97 and did a bunch of research on this when I first bought my car.
My 97 does not have the temp sensor plug behind the bumper into which to plug a sensor.
The certified porsche tech that works on my car told me that without it, running a wire and finding the right place to solder it would be a sizable undertaking that wasn't worth the time, labor, and money. He recommended I look on my iPhone for the current outside temp!
I did not like his answer, and would still like to do this mod if anyone can provide clear instructions as to how to add the temp sensor to a car without the wiring or plug for it.
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Randall,
According to Factory Repair Manual, '97
ONLY wiring diagram - Sheet 3, there is indeed wiring to the P-side fender well for the outside temperature sensor - the connector will be obvious and it is fed by a Brown/Blue wire and a Brown/Orange one. This is for the M659 OBC option which I believe is in all US Market cars.
I can send you the diagram if you wish.
Cheers!