- A dirty or improperly installed Mass Airflow Sensor - An improperly installed or dirty air filter can cause your check engine light to go on. Additionally you will experience poor fuel economy and your vehicle will eventually stall.
- Loose, Broken, or Faulty Gas Cap - One of the most common reasons why check engine lights go on is because your gas cap is not screwed on tightly. Read your gas cap! It usually says tighten until you hear a click.
- A dirty Oxygen Sensor - When your oxygen sensor gets dirty over time it will cause your check engine light to go on. Left untreated can lead to poor fuel efficiency and even damage your catalytic converter.
- Spark Plugs can fail over time especially in older cars. Older cars should replace spark plugs about every 30,000 miles. New cars should replace spark plugs every 100,000 miles.
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