What Problems Can a Missing or Damaged Gas Cap Cause?

The most common issue caused by a damaged, cracked or missing gas cap in modern vehicles is that it inhibits the fuel system's vapor evaporation system, which triggers the check engine light to turn on. Having a damaged or missing gas cap can potentially cause decreased fuel efficiency, and in areas of the United States subject to emissions standards testing, a damaged gas cap will cause the vehicle to fail the emissions test.

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