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  1. bigslippy

    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...