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Thread: Engine temp sensor

  1. #1
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    Engine temp sensor

    Hi all, when I brought my car I ran VAG com and it showed that the signal for the engine temp sensor was impulsive, it was then that I noticed that the temp gauge didn't actually work. I located the sensor, pulled it out and gave it a clean and refitted and it worked. Next time I started the engine it had stopped working again. Fiddled with it again and it worked then a repeat next time I started the engine. Would this be a fault with the sensor or the connector? Cheers lee

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  3. #2
    S3KO4's Avatar
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    Sensor is only ~£7 on eBay so change it and you would know. Bad temp sensor means tuning more fuel and to compensate for the fault and avoid getting lean therefore more money spent on fuel costs
    S3-8L REVO stage 2, Milltek, 3" DP & custom 3" decat, RS2 spark plugs, 4 bar FPR, Green-Cotton uprated upper/lower boost hose & TIP, Front Zimmerman & Ferrodo. LCR spliter. boost gauge, smoothed AB. Aero blades, H&R 5mm spacers. Best time 14.03sec, 0-62 in 5.7sec. 207gs @ 25psi , polished inlet mani. VAGCOM 805.1

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    Defo worth the wait :)

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    As above, just replace it, its only a few quid to replace it.

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    Yep, just make sure the replacement is Green, the older ones are Black.

    DC
    His: 2001 1.8T AUM. Hibiscus Red Pearl Effect - Hers: 2002 1.8T AUM. Metalic Silver.

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    Green??? im convinced mine is blue four pin

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    Bought one for my wifes car last year, the old one was black but, the new one was green and threads on here were saying that the newer ones were green etc. Anyway, if you buy it from Audi you will get the correct one!

    DC
    His: 2001 1.8T AUM. Hibiscus Red Pearl Effect - Hers: 2002 1.8T AUM. Metalic Silver.

  8. #7
    coatesy's Avatar
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    if you've got an old a3 T sport its a small square blue four pin sensor, my engine is AGU iv just changed mine and bought a green one then was like oh that's blatantly not going to fit so had to research and found out i needed the blue one ,

    Audi | Euro Car Parts UK’s No.1 Car Parts Retailer

    thats the one i had to put in my AGU

  9. #8
    dannyh's Avatar
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    i have the same problem. my car tem gets warm stood still but goes cold on the run, it through up the code temp sensor but is the thermostat gone too???

  10. #9
    dannyh's Avatar
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    also where is the sensor??????

  11. #10
    Welly's Avatar
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    Quote Originally Posted by dannyh View Post
    i have the same problem. my car tem gets warm stood still but goes cold on the run, it through up the code temp sensor but is the thermostat gone too???
    Nope, nothing wrong with your Coolant Sensor in which case, that is simply the thermostat. End of.
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  12. #11
    Welly's Avatar
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    Quote Originally Posted by dannyh View Post
    also where is the sensor??????
    Right hand side of the head, but that's irrelevant as you don't need one IMO.
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  13. #12
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    Might change my thermostat as well. I saw someone comment recently that there is a knack of changing it without loosing hardly any fluid can anyone give me a heads up on what this nackered is because I have only just had the fluid changed when I had the water pump replaced
    The weapon of choice... The a3

  14. #13
    dannyh's Avatar
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    ok cheers welly,
    so my car has the error code coolant temp sensor, my car wen sat still will rise to 90 however as soon as i start to drive i cools down to 60, is this then the thermostat and not the sensor, how come the sensor throws the code???

  15. #14
    Welly's Avatar
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    Quote Originally Posted by dannyh View Post
    ok cheers welly,
    so my car has the error code coolant temp sensor, my car wen sat still will rise to 90 however as soon as i start to drive i cools down to 60, is this then the thermostat and not the sensor, how come the sensor throws the code???
    Because it's seeing lower than expected readings normally.

    If the car is stationary and the temp rocks up to 90 on the dash, the sensor is working perfectly. Think about it, if the sensor was knackered, then it wouldn't be reading properly, like ever.

    When you are staionary, the water warms up due to the lack of airflow through the rad, you see that reflected in the sensor reading.

    Start with the thermo. 110%.
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  16. #15
    Welly's Avatar
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    Quote Originally Posted by lnewland View Post
    Might change my thermostat as well. I saw someone comment recently that there is a knack of changing it without loosing hardly any fluid can anyone give me a heads up on what this nackered is because I have only just had the fluid changed when I had the water pump replaced
    Drain the fluid out of the system using the tap on the bottom of the rad. This was you can catch and reuse the fluid. Sorted.
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  17. #16
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    thank you very much Welly, a great help i almost ordered a sensor...
    one las question...... where is the thermostat
    Thanks
    Dan

  18. #17
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    Located to the right of the alternator
    The weapon of choice... The a3

  19. #18
    Welly's Avatar
    VX220 SC Driver :)

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    Here's a how to guide for the thermo change (be warned, it's fiddly, but not that hard). It's for a Golf GTI, but the same principlesapply, everything is in pretty much the same place.

    How To: Replace the thermostat

    Thermostat here:

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  20. #19
    dannyh's Avatar
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    Thanks very much welly, I really appreciate it

  21. #20
    BÜBENGRÖPEN

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    Also have a look into you temp sender/switch - that was what was causing faulty temp readings on my dials and therefore leading to bad fuel consumption!
    Kristian
    No longer an Audi driver...

 

 

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