Will Spark Plugs Cause the Check Engine Light

Can Bad Spark Plugs Trigger the Check Engine Light? Yes, bad spark plugs can cause the check engine light (CEL) to come on. If spark plugs are worn, fouled, or misfiring, the engine’s computer (ECU) detects the issue and stores a trouble code, triggering the CEL. How Bad Spark Plugs Affect the Check Engine Light…