[A4] Engine Coolant Temp Sensor

Jim Coleman jacolemn at rochester.rr.com
Mon Apr 21 10:58:49 PDT 2008

I looked through Bentley manual, searching on ECT and could find only one
sensor located at the rear of the head in a coolant hose. And the wiring
diagram shows only one sensor with the wire going into Control Panel Module.
I don't have any CEL, just a funky gauge. Hate to call the dealer and ask.
Maybe I'll hang on until the last couple of hundred miles and see if a CEL
shows up.


-----Original Message-----
From: Peter Kirby [mailto:4pkirby at gmail.com]
Sent: Monday, April 21, 2008 8:14 AM
To: jacolemn at rochester.rr.com
Cc: A4 Mailing list (E-mail)
Subject: Re: [A4] Engine Coolant Temp Sensor

The ECTS that is covered by the extended warranty is the one that
sends a signal to the computer, NOT the one that drives the
temperature gauge.

I just had my ECTS replaced by the dealer under the extended warranty.
 My gauge was fine but it was sending a CEL any time the outside
temperature got above about +3C.

2001 1.8tq A4

On Thu, Apr 17, 2008 at 4:51 PM, Jim Coleman <jacolemn at rochester.rr.com>
> The question is for an 2002 A4 with 1.8L Turbo motor. What is the current
>  opinion on the need to replace the Engine Coolant Temperature (ECT)
>  Ours was acting strangely in that when starting up with a cold engine
>  would be coming out of the heater but the dash gauge would be pegged on
>  cold. Then It would go partway up and return to cold several times
>  returning to normal (middle of the dash gauge) after about 10 minutes of
>  operation. I was about ready to replace the sensor when we took the car
>  south on a trip to Florida where it was in a warmer climate for a few
>  and the symptom went away. It  seems to work fine now. Then a letter came
>  from Audi stating that the ECT was now warranted to 100K miles due to
>  failures. We have 98,600 miles on the car now so the ECT warranty is
>  over for us. So should I go to the very inconvenient Audi dealer and get
>  replaced? There was never a CEL or any other indication. Will they
>  it even though it seems OK now? If I wait, is the ECT sensor very
>  it I have to do it myself later outside of warranty?
>  Some of you on the list must have had a similar symptom. What would you
>  Jim
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