blues1955

Gareth and other interested persons, I had a courtesy diagnostics test performed today by a local Audi dealer and it was no surprise that the result showed that there was an intermittent problem with the coolant temperature sender. So I asked how it was possible to be able to monitor the coolant temperature constantly using my fault reader connected to the OBD socket. The answer is that the sender generates 2 outputs; one going to the engine management controller (and probably also to the OBD socket) and the other to the temperature gauge. There is an issue with the temperature sender so I will replace it. Thanks again, Gareth, for your interest and help with this problem. Regards, Michael

Gareth, I want to update you and any other members who have been following my problem. I picked up the car on Thursday. My fault reader device connected to the OBD gave me coolant temperature in real time (between 88 and 93 C). Interestingly the temperature gauge jumped into life during the journey, indicating 90 C. However the reading dropped totally to the left after a while and later again read correctly. The oil temperature gauge which reads between 60 and 180 C indicated a constant temperature (roughly 80 C) after about 8 miles. The coolant temperature sender is working fine so I will now try to identify the reason for the intermittent gauge reading. Regards, Michael

Gareth, Thanks for your replies to my RS6 temperature issue. I will collect the car on Thursday this week. I have consulted a local VW/Audi specialist who recommends that I run a OBD check before changing any sensors. It sounds like good advice. Regards, Michael

Thanks, Gareth. I bought my RS6 on Friday and I paid attention to the water and oil temperature gauges on the test drive. It is possible that the car was not driven sufficiently far or "hard" enough to get the car up to normal operating conditions. From my "normal" car experiences acquired over 50 years I would have expected the water temperature to have shown an increase on the gauge (but I could be wrong as I have no experience of a turbo super car). I have an 23 year old MGF summer car which also has an oil temperature gauge and this will only "start to move to the right" after around 5 miles. The MGF runs with the temperature gauge midway but the oil temperature never goes above 80C (I assume this gauge is correctly calibrated). To be completely honest, I always keep an eye on the MGF's water temperature but only occasionally on the oil temperature. It is possible there is no issue with the RS6 oil temperature gauge but I will buy 2 new senders for peace of mind. I will keep the forum informed of how easy it is to locate these senders in the engine bay and replace them. Regards, Michael

Hello, Gareth! Thanks for your response. The car was driven 4 miles on a mixture of town roads and a by-pass and then sat idling for an additional 15 minutes. The engine bay was warm but the needle of the gauge didn't move, so I suspect a problem. I assume that what you call the coolant temperature sender is the same as what I am calling the coolant temperature sensor. I have viewed some Youtube videos but haven't yet found one showing the location of the RS6 sensor. Can you please indicate where it is located? I have one further question. I am not fully convinced that the oil temperature gauge is working. What should this temperature be expected to read after 4 miles of "light right foot driving" and 15 minutes idling? Where is this sensor located? Regards, Michael

My RS6 2003 Saloon coolant temperature gauge is not reading correctly. When the ignition is turned on the needle moves very slightly to the right. As the engine warms up the needle doesn't move, staying totally on the left. I consider myself capable to sort out sensor or wiring issues but I have not started any troubkle shooting. Has anyone experienced the same problem and can give some guidance? Thanks