SOURCE: 2000 maxima with 84,000 miles
the code means the converter on the side cyliner # 2 is not working like it should ,to check to be sure you need a scan tool and data from the front and rear o2 sesor cannot mimic each other if they do the converter is bad ,there are aftermarket converters for that car but they dont preform as well as the factoy one .
SOURCE: won't stay running upon starting in the morning
sounds like a vacuum leak is causing the problem. consider this. idle bypass valve can be going bad or is bad.
if the engine is getting weak fuel pressure you should see a fuel light come on when this occurs. indicating improper pressure, witch the car running quickly tap the gas pedal.
now dose the problem happen in only cold weather so far? or also hot?
if not then your fuel pressure regulator is faulty.
i suspect the fuel pressure regulator myself but this is a procedure to help you determine it.
SOURCE: code PO420 catalyst system efficiency below threshold
you may have a bad converter, its not cleaning the exhaust, but on the other hand a bad rear o2 sensor can also cause this problem,there is a wat to test but you would need a scan tool or scope,replace the other sensor, if light returns then replace the converter, no money lost, if you were to replace the converter the o2 sensors should also be replaced. you have 165000 miles it would be crazy not to replace sensor and install new cat, so basically your just doing it in 2 steps and may get lucky and not need a cat. good luck.
Testimonial: "Your information is exactly what I needed to know.I suppose I just did not want to spend the money for a cat. converter. Thanks again for your help. "
SOURCE: check engine light on
Diagnostic code produces P0420 catalyst system efficiency below threshold-Bank 1. Probable causes are listed as follows:
1-air leak in exhaust before rear 02 sensor, 3-Fuel system fault,
4-faulty catalytic converter.
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