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Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 3935
Experience:  Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
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Aftermarket magnaflow cats on a 2005 nissan xterra. Codes

Customer Question

Aftermarket magnaflow cats on a 2005 nissan xterra. Codes 420, 430, 1289,1288
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: at first it was throwing different codes, then i reconnected the exhaust ground, cleared the codes, and took it a shop for inspection. He pulled a code for the thermostat and said it wouldn't pass. I come home and put my reader on in and it throws the 4 above mentioned codes, but not the code the shop got 8 hours earlier
JA: Are you fixing your Xterra yourself? What have you tried so far?
Customer: so far i just reconnected the ground wire on the exhaust
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 10 months ago.
Category: Nissan
Expert:  Jake replied 10 months ago.

Hey there, thanks for the question.

Expert:  Jake replied 10 months ago.

are you saying you got these codes immediately after replacing the cats?

Customer: replied 10 months ago.
I switched the cats about two years ago
Customer: replied 10 months ago.
At the time everyone said i needed to use the actual OEM cats and that is why i was getting codes. Nissans apparently don't automatticly adjust when the backpressure changes.
Customer: replied 10 months ago.
Is that true?
Expert:  Jake replied 10 months ago.

no, not true. If the hi flow catalysts were going to be an issue you would have seen it within 20 miles of driving.

Expert:  Jake replied 10 months ago.

the catalyst inefficiency codes are picked up when the rear sensor is essentially mimicking the front sensors readings instead of the catch and release fluctuations you generally see from a working catalyst.

Expert:  Jake replied 10 months ago.

The fact that you have a/f sensor codes and catalyst codes on both banks, tells us you could fuel trim issues

is the vehicle running poorly?