How do you diagnose a gas cap?

  • Cap does not tighten properly. One of the most common symptoms of an issue with the gas cap is a cap that does not tighten properly.
  • Fuel smell from the vehicle.
  • Check Engine Light comes on.
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    Is check engine light always serious?

    When your car's check engine light illuminates on your dashboard, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could be a minor issue, such as a faulty gas cap, or it could mean something more serious, such as a misfiring engine. via

    What are the main causes of a check engine light?

  • Oxygen sensor (or O2 sensor)
  • Catalytic converter failure.
  • Spark plug or ignition coil failure.
  • Airflow sensor failure.
  • Replace the thermostat.
  • Replace exhaust gas recirculation (EGR) valve and clean all EGR ports.
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