p0429 code on 2006 Nissian Altima suspect converter

Question

getting a p0420 code fault engine service light comes on and then goes off.

Answer 1

Hi there,

Typically the catalytic converter is the problem with these. You can lower the exhaust pipe and look up into the converter to see if it's broken or if it's melted. If it looks good, then it is possible the rear O2 sensor is failing and causing the code.