This document provides the top 5 reasons why a check engine light may come on:
1. An oxygen sensor needs replacing, which can cause other issues if ignored.
2. A loose or faulty gas cap can lower gas mileage and increase emissions.
3. A failing catalytic converter may need to be replaced, which should be prevented through regular maintenance.
4. A mass airflow sensor may need replacing if not maintained through yearly air filter changes.
5. Spark plugs and wires wear over time and should be replaced according to the maintenance schedule.
The key issue is replacing a catalytic converter, as it should not fail with proper regular maintenance. It is important to get any check engine light