Question about 2005 Volvo S40

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S40 Warning Lights

I have just purchased a 2005 S40 2.4i and the fault in emission system light is on.Is this a common thing car only has 38000kms.

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  • Clare10 Apr 19, 2009

    I have a Dec 04 S40, emission light comes on every few weeks. Have had it checked, garage says no fault code showing. Outside temp gauge also playing up. Car wouldn't start a couple of weeks ago, after jump starting, took out key - lights stayed on & battery still buzzing, stayed on until run down. Took into Volvo garage, they charged me £80 to say they couldn't find anything wrong. Has anyone else had this problem? Could there be a loose connection somewhere?


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Usually when the new body style CEL comes on...most likely it'll be an ECM fuel trim code. There is an updated SW that will correct this problem.

Posted on Aug 14, 2008

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Faults can happen from day one, on. That is why there is a warning system.
If the warning light is on, you must access the computer system to access which fault code is present. Many different companies manufacture tools to do this from an inexpensive generic one from Launch Tech of China to the original factory unit made for Volvo by Balco. Depending on the fault code, the most common one that I see is caused by the fuel cap either installed incorrectly or not fully tightenned. Check your fuel cap and if it is not installed correctly or not fully tightenned, please re-install. If the fuel cap was the problem, the warning light will go off by itself in a few days.

Posted on Jun 08, 2008

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