1. Check the gas cap. A loose or improperly tightened gas cap can cause the service engine soon light to come on. Make sure the gas cap is tight and properly seated.
2. Check the air filter. A dirty or clogged air filter can restrict airflow to the engine, which can cause the service engine soon light to come on. Check the air filter and replace it if necessary.
3. Check the spark plugs. Worn or damaged spark plugs can cause the service engine soon light to come on. Check the spark plugs and replace them if necessary.
4. Check the oxygen sensor. A faulty oxygen sensor can cause the service engine soon light to come on. Check the oxygen sensor and replace it if necessary.
5. Check the catalytic converter. A clogged catalytic converter can cause the service engine soon light to come on. Check the catalytic converter and replace it if necessary.
6. Have the vehicle diagnosed by a qualified mechanic. If you are unable to determine the cause of the service engine soon light, have the vehicle diagnosed by a qualified mechanic. They can use diagnostic tools to identify the problem and make the necessary repairs.