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OBD II P0420, Catalyst System Efficiency Below Threshold. In some cases, there may be some performance problems noticed by the driver such as a lack of power from a restricted and/or damaged Catalytic Converter.
Common Problems That Trigger the P0420 Code
- Inefficient Catalytic Converter(s)
- Defective Front or Rear Oxygen Sensor(s)
- Misfiring engines
Common Misdiagnoses
- Oxygen Sensors good-day ! hope this helps !
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∙ 12y ago
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