A P0073 code is fairly easy to diagnose on average. Most of the time, it’s because of a damaged or corroded sensor connection. Oftentimes, you only have to look at the sensor connections to see Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. This video shows where the radiator drain plug (petcock) is located on a 2013 Audi Q7. Fill up the radiator with distilled water and run the engine. Hi all. I am having trouble to locate the Coolant temperature sensor on my 2006 Audi A3 3.2l quattro. Any help/ diy advice will be much appreciated. Thanks in advance. It is mounted in the thermostat housing. Look just to the right of the engine (oil filler cap) and down. You should see it. Step 2: Replace the coolant temperature sensor. Before anything else: Examine the wiring harness plug for the temp sensor. Use Mass Air Flow cleaner and a brush to clean the plug if there is any residue or corrosion. Plug the new coolant temp sensor into the wiring harness, and fit it back into the housing. Hello the coolant temperature sensor should be located very close to the water outlet from the engine - if you follow the radiator top hose back to the engine and then look in the immediate area on the cylinder head you should find the 2 wire coolant sensor As on other modern diesels the glow plugs are used all the time as well on every start - cold starts are still the most / heaviest duty How to change engine / coolant temperature sensor on VW group engines (VW/Audi/SEAT/Skoda) Golf mk4 generation. Car shown is 1.8t Skoda Octavia vRS, same par I am getting mixed information online and in the $20.00 manual I bought. In the manual it says that the 2006 four cylinder does not have an actual ECT. It is an CHT (cylinder head temperature sensor). I need to know where the sensor is located on the vehicle to verify if the guy at the auto parts store gave me the proper sensor or not. Re: Coolant Temp Sensor Location - 3.0 TDI – 27-08-2014,10:54 AM. Originally Posted by Lukenkarl. It is under the pipe that goes form the Air mass meter to the turbo. Ah right, so not too hard to get at. Just a case of removing that pipe. Its odd that ECS Tuning and other part stores list the "grey" 2 pin sensor (lower radiator hose) for along with the green 4 pin sensor (ETC) as parts for the 3.0 That is strange. We have the one green one, and then a low coolant sensor in the coolant tank. The average cost for most vehicles of the coolant temperature sensor replacement cost for parts ranges between $55 and $80. However, the lower end of the coolant temperature sensor price can go as little as $35, while the high end of the coolant temperature sensor parts price is around $90. Symptoms of a Failing Engine Coolant Temperature Sensor Avrlf.