fastsoup Posted November 7, 2020 Share Posted November 7, 2020 Howdy all, 2009 Audi A3 Quattro: The other day on my way into work (50km drive) I had the cruise control set at 110kph and somewhere around the 40kmh mark, there was a blip (which I presumed was a misfire) and a few mins later the check engine light came on. On the drive home it was more less the same...no other issues. Scanned when I got home and got code P2181. Cleared it and was on high alert on the drive in the next morning. So this time, turned HVAC on & off, stayed around the 100kmh an hour speed and no engine light. Temp was at 90'c (centre mark) or slightly under (about 7'c ambient temp). I had heat from the vents (thermostat was open). On the way home I churned it up to 110-115kph and about 10 mins in, same misfire feeling blip and engine light on...no other issues. Got home, scanned and it was P2181 again. Cleared the code. Today I ran errands around town for a few hours...heat blasted, temp centre or just below, speeds below 100kph, and no engine light or blip at all. Could it be my coolant temp sensor? I find it odd that the engine light comes on with the 110kph+ speeds and what's with the blip? Anyone have a clue or possible diagnostic approach? F Quote Link to comment Share on other sites More sharing options...
fastsoup Posted November 8, 2020 Author Share Posted November 8, 2020 According to some other posts on VWvortex, it could be the thermostat. Quote Link to comment Share on other sites More sharing options...
Steve Q Posted November 9, 2020 Share Posted November 9, 2020 I'd look at changing that first and see if it resolves the issue. Quote Link to comment Share on other sites More sharing options...
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