Sometimes the check engine light comes on when the gas cap is not properly closed. It can also happen when the car is older. Mine was and I could see mold/dirt on the sealing surface. This new cover was easy to install. If you can't do that, you probably shouldn't be driving a two-ton car that's moving at 65 miles per hour. How long it will take? Who knows, but my check engine light is out and I'm awaiting an emissions test. You might as well get that cap for less than $10 -- that's a lot cheaper than buying a new Tesla.
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