Here's how bad spark plugs can cause the check engine light to come on:
- Misfires: Bad spark plugs can cause the engine to misfire, which means that the fuel-air mixture is not igniting properly in one or more of the cylinders. Misfires can cause the engine to run rough, stall, and vibrate.
- Oxygen sensor problems: Faulty spark plugs can cause the oxygen sensor in the exhaust system to malfunction. This sensor measures the amount of oxygen in the exhaust gas and helps to regulate the fuel-air mixture. If the oxygen sensor is not working properly, the engine may run rich (too much fuel) or lean (too much air), which can cause the check engine light to come on.
- Catalytic converter problems: Misfires caused by bad spark plugs can damage the catalytic converter, which is a device in the exhaust system that helps to clean up emissions. If the catalytic converter is damaged, the check engine light may come on.
If your check engine light comes on, it's important to have the cause diagnosed and repaired as soon as possible to avoid further damage to your vehicle and poor performance.
