2001 nissan sentra P0430

Question

catalyst system efficiency below threshold (bank2)

Answer 1

Hi there,

This indicates you will need to replace the converter. If you look at the exhaust manifold on the car, there are actually 2 converters, a bank 1 and a bank 2. This code as you know is for bank 2, but both converters are replaced together. It is possible you could have the code because of a bad O2 sensor or leaking exhaust system.