Question about 2004 Toyota Sienna

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Engine lightcomes on when my Sienna sits idling for a few minutes

Engine light comes on when my Sienna sits idling for a few minutes. It will not go off until I tighten the gas cap. This is the only time that it does it. What could be the cause of this?

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The fuel system is a pressurized system designed for optimum environmental protection. If the fuel cap is loose it will trigger the light to come on. If it is coming on all the time and you can turn it off by tightening the fuel cap, it's probably time for a new fuel cap. The internal pressure relief valve in the fuel cap itself may have gotten old and is not holding the right amount of pressure or is vibrating loose. Try replacing the fuel cap and seal, and see if this fixes the problem. Make sure you bring the old one in with you to the auto parts store so they can make sure it is an exact match. If the fuel cap is worn out, it may not pass state inspection. (I'm not sure if your state checks for that, but NJ does) Good luck and don't forget to rate! Thank you!

Posted on Mar 01, 2009

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