I just replaced my MAF on my 2000 maxima SE and after 2 days I now have a
P0430 code. Any ideas if it's a sensor or the cat itself?

Dave wrote:

I am pretty sure it was a 430, right before I cleared it.... I want to
make sure it comes back before I start replacing parts.

"JimV" <jv9999 (AT) yahoo (DOT) com> wrote

P0430 (Left Bank, -B2) Three Way Catalyst function for California.

The ECM monitors the switching frequency ratio of front and rear
heated oxygen sensors.

A warm-up three way catalyst with high oxygen storage capacity will
indicate a low switching frequency of rear heated oxygen sensor. As
oxygen storage capacity decreases, the rear heated oxygen sensor
switching frequency will increase.

When the frequency ratio of front and rear heated oxygen sensors
approaches a specified limit valiue, the warm-up three way catalyst
malfunctoin is diagnosed.

Malfunction is detected when warm-up three way catalyst does not
operate properly, warm-up three way catalyst does not have enough
oxyagen storage capacity.

Possible cause:


Warm-up three way catalyst
Exhaust tube
Intake air leaks
Injectors
Injector leaks
Spark plug
Improper ignition timing

Hope this helps.

depending on your mileage and in service date, if the cat is judged to be
bad it would be covered under warranty


"Dave" <notme (AT) comcast (DOT) com> wrote

Dealer replaced the cat under warranty. Thanks for the help.

"NissTech" <Haywood_Jablowme (AT) msn (DOT) com> wrote