Check with seller Fixing Catalyst System Efficiency Below Threshold Issues

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Other Vehicles Published date: 01/06/2023
  • Country: USA

If you see the term "catalyst system efficiency below threshold bank 1" while looking at the diagnostic codes of your vehicle, it means that the efficiency of the catalyst system in bank 1 (which typically refers to the exhaust system on the side of the engine where cylinder 1 is located) has fallen below the threshold.

This can be caused by a variety of issues, such as a clogged catalytic converter, a malfunctioning oxygen sensor, or problems with the fuel system.


It is important to address this issue as soon as possible to prevent further damage to the vehicle and to ensure that the catalyst system is functioning properly. Ignoring the problem can lead to increased emissions and potentially costly repairs in the long run.

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