Bad O2 Sensor or Catalytic Converter: How to Tell the Difference

Exhaust system highlighting the locations of O2 sensors and the catalytic converter, with indications of common signs of failure.

When your vehicle’s check engine light comes on, it can be caused by various factors, but two of the most common culprits are a bad O2 (oxygen) sensor or a failing catalytic converter. Both components play vital roles in your vehicle’s exhaust and emissions systems, but how do you determine which one is causing the issue? Understanding the differences between …

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