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have a red lightning bolt light that came on two days ago. I was running the air and it started blowing hot once the light came on. I pulled into a parking lot, turned the car off and waited 5-10 minutes. Cranked the car back up, no red lightning bolt. Didn't try the air. Drove to O'Reilly to get tested. No luck due to Covid. Independent mechanic checked and no code was given, but warning light was on. Mechanic took off gas cap and waited a few minutes and put it back on. Red lightning bolt warning went out. I was advised to purchase a new gas cap. Is this correct? If not please help!!!

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