1. Check the gas cap. A loose or missing gas cap can cause the check engine light to come on. Make sure the gas cap is tight and secure.
2. Check the air filter. A dirty air filter can also cause the check engine light to come on. Replace the air filter if it is dirty.
3. Check the spark plugs. Worn out spark plugs can cause the check engine light to come on. Replace the spark plugs if they are worn out.
4. Check the oxygen sensor. A faulty oxygen sensor can also cause the check engine light to come on. Replace the oxygen sensor if it is faulty.
5. Have the vehicle scanned for codes. If none of the above steps work, you may need to have the vehicle scanned for codes. This will tell you what is causing the check engine light to come on and allow you to fix the problem.
Once you have fixed the problem, the check engine light should go off automatically. If it does not go off, you may need to have the vehicle's computer reset.
