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2002 Audi A4 code-PO118 engine coolant temp circuit high Any clues or common problems?

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Hello! Is the engine over heating; Loss of coolant, hissing...etc... Or is it a false indication? Also, is the engine a 1.8L or a 3.0?

Send a comment.............Guru............saailer

Posted on Jul 08, 2010

  • 1 more comment 
  • squindojr Jul 08, 2010

    it is a 1.8L and not over heating, I will check to see if gauges are accurate.

  • squindojr Jul 08, 2010

    Noticed cooling fan runs as soon as car starts and is cold.?

  • David Burbee
    David Burbee Jul 08, 2010

    Hello! The Engine Coolant Temperature (ECT) sensor is defective...It is mounted on top of the radiator...It has a 2 wire connector...Colors are...Yellow/Black...and Blue/Black...It is a variable resistor that changes value inverse to temperature...First check the connector for tightness or poor connections...You'll need an ohm meter; Don't mean to insult but are you familiar with using one?

    When engine is cold...Pull the connector and put the probes across the two pins on the sensor...should read around 3,000 ohms...Bring the vehicle to operating temperature and read again...At 210 degrees resistance should read around 150-200 ohms...If not sensor is defective; Sending a false signal to the computer...Cost isn't bad...$15-25

    Once replaced you'll need to clear the code (unless it clears on its own) by disconnecting the battery for several minutes...BUT BEFORE YOU DO...In order not to lose your stereo...Connect a 9vdc battery to a cigar lighter plug (Make sure polarity is correct)...Then disconnect the + terminal of the battery...The 9 volt battery will "hold-up" the stereo...Send a comment.............Guru............Saailer


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