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Dual Temperature Sensor help

bigslippy Jul 21, 2012

  1. bigslippy

    bigslippy New Member

    Hi guys , I have a 2003 A4 1.9 tdi quattro, temp gauge hasn't worked for a couple of years and I had heard that if the temp
    sensor isn't working , the ECU still thinks the engine is running cold and uses more fuel?

    Is this the case as round town driving I get mid to high 30's , when I go on a journey I get mid 40's.... I wouldve thought 50+ would be easily achievable.

    However , I've now discovered the part I need is called a dual temp sender .... does mean that 1 part tells the temp gauge what the temp is and the other part tells the ECU?

    Hope this makes sense to somebody[​IMG]

    Any thoughts/wisdom welcomed[​IMG]
  2. marktdisport

    marktdisport Active Member

    To be honest after a few people on here with 1.9 Q say they only get mid 30's and there's a few fwd only doing mid to high 30's.. My fwd comes in as average around 42-45 mpg but if I do 550 miles then 400-410 will be dual Carriageway to work @ around 65-70 mph...on a very long journey it will creap to a near 50 driven carefully.. The temp sensor will work in a few ways but they all do.. Should just be a simple change over
  3. Greeny233

    Greeny233 It's all about the V8. Team V8 Team Silver Audi S4 Audi Avant Owner Group

    Just get your temp gauge fixed, usually only the thermostat or coolant temp sensor.
  4. pauldazzle

    pauldazzle Well-Known Member

    Temp sensor failure is one of the most common failures on VAG cars.
    Yes the CTS has 2 outputs 1 to the gauge & 1 to the ECU. If the ECU is getting incorrect reading from the CTS it won't fuel correctly. Make sure you get a genuine VAG replacement (£25ish) Aftermarket CTS's are notorious for failing.

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