Question about 2001 BMW 5 Series

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Evaporative system I had a mechanic scann my 2001 525i and the scanner said the the evaporative system has a problem. The mechanic reset the service engine light. It went off for a couple of days and is now back on again. The mechanic told me that the service engine light may have came on because I did not put on my gas cap on correctly. Im wondering what other reasons the evaporative system would cause the light to come on. Thank you !

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  • Bruce Hathcock May 11, 2010

    The purge cansiter valve may be malfunctioning and the pressure pump that pumps up the tank after being filled may be leaking or going out. And cap may be leaking try replaceing the gas cap seal. you know try KISS Keep it simple stupid, Not calling you that just had to remember that when working on cars as a lot of times you get into really complex problem solveing for something as simple as a gas cap gasket cracking.

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The system consists of a charcoal cannister that collects gas vapors from the fuel tank. It stores these vapors until certain engine conditions are met, and then a purge valve/solenoid opens and the vapors are used in the combustion process. A faulty gas cap will cause the problem if it is not sealing or venting properly. A bad purge solenoid could also not be allowing the cannister to purge and the cannister could be full.

That's a basic synopsis. Hope this helped and best wishes.

Posted on Jul 25, 2009

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