Q: check engine light and gas cap? on 2008 Lexus RX400h

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my way to work this morning, the check engine light came up. Lexus dealership said the gas cap is not sealing properly that is the reason the light came up and i need to order a new cap. this car has only 35000 miles and gas cap looks new, is this a real problem? do i need a new cap?

(4) Answers
Looks can be deceiving , especially when the valving in a gas cap is not easily visible. The round o-ring you see is often not the part that leaks. IF they are set-up for emissions testing , then they should have equipment to test and verify gas cap failure........Maybe not enough fiber in cars diet??
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