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Dual Temperature Sensor help

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by bigslippy, Jul 21, 2012.

  1. bigslippy

    bigslippy New Member

    Jul 15, 2012
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    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]
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  3. marktdisport

    marktdisport Active Member

    Jul 14, 2011
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    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
  4. Greeny233

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

    Mar 17, 2011
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    Just get your temp gauge fixed, usually only the thermostat or coolant temp sensor.
  5. pauldazzle

    pauldazzle Well-Known Member

    Nov 11, 2009
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    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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