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

Comparison between a faulty oxygen sensor covered in soot and a damaged catalytic converter with visible cracks.

When your car’s check engine light comes on, it could be related to either a bad oxygen (O2) sensor or a faulty catalytic converter. Both components are essential for managing your vehicle’s emissions and ensuring optimal engine performance, but understanding which part is causing the issue can be challenging, as many of the symptoms overlap. In this article, we’ll guide …

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