The check engine light has come on and off for about the last 10,000 miles; vehicle has 105,000 miles. Major tune-up has been done and car has been checked several times and codes reset only to have light appear again. Amount of fuel in tank does not seem to have any correlation to light. After last service am detecting a very strong gasoline odor but no evidence of leak. Service included a gasoline additive and last time I returned vehicle because of odor all gasoline was changed to clean out tank. Odor persists. Check engine light on again. Big puzzle.
 
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Ask Your Question2001 Volvo S60
Question: My check engine light is constantly coming on but no problem can be found.
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