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Will a bad gas cap cause my check engine light to come on?
My check engine light comes on and stays on for about 2 days, then shuts off for about a day. Could this be a bad gas cap, i had to replace it awhile ago and it's one where it doesn't click on but just turns onto it.
3 Answers
- ChrisLv 51 decade ago
A bad seal on the cap can cause an Evap Recirculation error to come up. The best ones are the non-locking ones, as any Smog shop will also tell you cause they keep them on hand and sell them too you if yours fails the vacuum test.
- 1 decade ago
Many newer cars use a pressurized fuel system (meaning the tank) to get better fuel economy and to recover unspent fuel from the rails. Not only can it cause a "check engine" light but it can also cause some of them to not even crank. I have seen this on a few Mazda and VW's. I hope this helps.
