What is the cause of catalyst-system-efficiency-below-threshold bank 2 and how do you fix it

Question

https://www.autocodes.com/qa/7667/p0430-catalyst-system-efficiency-below-threshold-causing

Answer 1

Hi there.

Generally the only repair would be to replace the converter on bank 2. Sometimes a bad rear O2 sensor can cause the code, but as long as the engine is performing normally you will usually have to replace the converter to resolve the issue.