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  1. #1
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    Dual Temperature Sensor help

    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

    Any thoughts/wisdom welcomed

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  3. #2
    marktdisport's Avatar
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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
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  4. #3
    Greeny233's Avatar
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    Just get your temp gauge fixed, usually only the thermostat or coolant temp sensor.
    Chris "the machine" Green.
    2004 Audi A4 1.9tdi Sport Quattro Avant

  5. #4
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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.
    A4 Avant B6 1.9 TDI 130 Sport (6) Moro Pearl Blue, GMBH S Line Kit, Decat, 165bhp remap, EGR delete, K&N panel, Dunlop SP Sport Max, Full Leather, Cruise Control, Full DIS, Bose, Audi phone prep, Cooled Glove Box, Rear privacy glass, Rear parking assist.
    2003 Seat Ibiza 1.2 TSI FR in Lima green.

 

 

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