LocationKilwinning Ayrshire. the coolant temperature sensor is a known problem area which often goes faulty and lights up the overheating warning light on the instrument panel and switches on the electric fan - on a cold engine. My A3 TDI is the 4th diesel Audi I’ve had over the last 25 years and they all without exception ran bang Ambientair temperature sensor (also known as outside air temperature sensor) testing and replacement. This little sensor works with the in-car temperature s Thecoolant temp sensor is the one controlling gauges, ECM. The o rings stick to the sensor and the body. Put a wrench on the plastic wire housing and twist, that breaks the o ring free. Some have had better luck with the engine slightly warm, not cold or hot. Always use new o ring. LocationEngine. Engine Coolant Temperature Sensor. Fits A3. A3; 2.0L TDI. Golf Sportwagen; 2.0L TDI. Golf; 2.0L TDI. Engine Coolant Temperature Sensor - Repair or Longstory this, it follows from previous woes of sensors, DPF etc. The 2.0 tdi 170 quattro got sorted by cleaning DPF and replacing the temperature sensor one eventually, it came out of limp mode and all lights off. Plus cleaning a stuck EGR etc etc. It drove for 1000 miles or so fine. Then the glow plug and MIL light come on again, my Hithere I have a audi a3 8p 2.0tdi. I have had some overheating issues. Location Netherlands. Aug 23, 2020 #2 turns out it was a fault coolant temperature sensor. If you haven't sorted it, and you still have this issue, I would pop the sensor out, give it a clean and just make sure the o ring is still in good nick. Inthis video, we can see where the coolant temperature sensor is located in the Audi A3 and how to replace it, which is a very simple operation. As shown, it is located at about OriginallyPosted by walky_talky20. On the drive by wire 1.8T's, the oil temp sensor is in the pan - integral to the oil level sensor. I never thought mine was terribly accurate either. I've got literally no idea how the thing works, but it does seem like after key on it does take a bit of time before it reads again. AUDIA3 Hatchback (8L1) 1.6, AUDI A3 Hatchback (8L1) 1.8, AUDI A3 Hatchback (8L1) 1.8 T, AUDI A3 Hatchback (8L1) 1.8 T quattro, AUDI A3 Hatchback (8L1) S3 quattro The steps may slightly vary depending on the car design. Important! This tutorial was created based on the replacement procedure for a similar car part on: AUDI A4 Saloon (8D2, B5) 1.6 Oneday i opened the trunk side storage compartiment on my Audi A3 hatchback S-line from 2019 and found out the items in there were wet. After many attempts to find where this was coming from, i was pretty confident it would be the 2 little tail light rubbers that keeps them in place in the chassis so i siliconed them shut. See photo here. O1C5.