[rebeltown]

CJBoxster has hit nail on the head in my opinion. I have an Audi A4 that has gone through a couple temperature sender units each with a different symptom. Once the car would not start at all and another time the temperature guage would not come off the downscale stop but the car ran fine. I ordered a few on line just in case because the shipping cost more than the sensor. Sensors were about $7 on line and about $40 at the dealer. After having it towed to the dealer the first time I was embarassed when I found out how easy and cheap it was to do myself. I think it is accessible from under the engine compartment near cylinder #4 on a Boxster.