Afterflushing the system, changing both temp sensors and soldering the connector leads back onto the harness, I noticed that the radiator fan will not run anymore. If I unplug the connector on that sensor, it will start running again. Heater blows hot, I am pretty sure I got air out of the lines. One observation is that the bottom hose of the 2001Jetta TDI. Apr 6, 2016. #3. I realize this idea may be controversial but if my fuel temp sensor read low temperature all the time I would leave it alone. As the fuel temperature goes up, and the coolant temperature goes up, in order to meet NOx requirements, the ECM starts to retard the timing. More retard equals less power; that is coolanttemp guage only works sometimes. I recently got this 02 A4 1.8 quattro the coolant guage goes from cold to a little under half and flickers when doing so then goes to cold. If i turn the car on and off i can get it to bounce around under the half mark. I already installed two temp guages at the thermostat housing one from napa and A4A4 cabriolet/S4 (B6 chassis) . ruffrida Registered User Went to do me temp sensor today,as usual the stupid plastic clip that holds it in broke and was well and truly stuck in the housing, so with a tiny flat head I start prizing the clip out, 1 side was no problem,but the side closest to the head was been a proper pain in the bum Improvethe performance and mileage of Audi A4 by giving your throttle body a good cleaning. Free Shipping over $99! 02 a4 b6 1.8t quattro i purchased a coolant refresh kit that includes a new j plug, thermostat, temp sensor, etc and have it scheduled at a local shop to do the work. from what i've read the throttle body has to come off A4B6 1.8T coolant temp sensor location? By lwodrumm in forum Audi A4 - B6 Forum - 2002 - 2005 Replies: 12 Last Post: 28-12-2007, 05:41 PM. location of temp sensor on 115PD TDI Passat. By printman in forum Passat - B5 Forum - 1997 -2005 Replies: 4 Re P246e bank 1 exhaust gas temperature sensor 4 – 18-07-2017, 11:56 PM. This one will be connected underneath the car clipped to the side of the under chassis. They are around £115 to £130 from the dealer but I have found them for £70 odd at a European car parts retailer (Auto Doc). Theoil temp sender is with the oil level sensor on the bottom of the oil pan. The cheap sensor you found is on the 2.8 engine not the 2.7t. This is from my own experience. Good luck. One more thing, get the oem yWhv.