There are a few things that you can try before resorting to more drastic measures, such as replacing parts. Here are a few tips:
* Check the gas cap. This may seem like a silly suggestion, but a loose or malfunctioning gas cap can actually cause the check engine light to come on. Make sure that the gas cap is tightened securely and try restarting the vehicle.
* Check the air filter. A clogged or dirty air filter can restrict airflow to the engine, which can also trigger the check engine light. Try replacing the air filter and see if that fixes the problem.
* Check the spark plugs and wires. Worn out or damaged spark plugs and wires can also cause the check engine light to come on. Inspect the spark plugs and wires and replace them if necessary.
* Check the oxygen sensor. The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gases. A faulty oxygen sensor can cause the check engine light to come on. Try replacing the oxygen sensor and see if that fixes the problem.
If you have tried all of these things and the check engine light is still on, you may need to take your vehicle to a mechanic for further diagnosis.