Can a bad muffler cause the check engine light to come on?

A bad muffler on its own typically does not cause the check engine light to come on. While a faulty muffler can affect the vehicle's exhaust system and create issues with emissions, modern vehicles are equipped with sensors and diagnostics that specifically monitor emissions-related problems.

The check engine light is generally triggered by malfunctions or irregularities detected by various sensors and systems in the vehicle. Common causes of the check engine light include issues with the oxygen sensor, catalytic converter, mass airflow sensor, fuel system, or emission control systems.

If you notice your check engine light turning on, it's recommended to have your vehicle checked by a professional mechanic, preferably one with experience in automotive diagnostics. They can accurately diagnose the root cause of the issue and address any necessary repairs or maintenance. Ignoring the check engine light may lead to more serious problems and potential damage to your vehicle's components.