ECM Relay Replaced, Now P0420 Error

drumminlogan · Postby **drumminlogan** » Sun Feb 26, 2012 10:41 pm

So my 2006 pathfinder was stalling in the middle of driving last week. I read about the ECM relay recall and took it to the dealer and they replaced the relay. After that it seemed to drive well and hasn't stalled. However a week later the service engine soon light came on. I checked the error code and it is returning P0420 Catalyst System Efficiency Below Threshold (Bank 1) and the P0430 code.

It seems really interesting this happened after less than 30 miles of driving after the ECM relay was replaced.

I'm not much of a mechanic but I want to be informed and hopefully not have to spend money on replacing the catalytic convertors. Is it just a coincidence that this code would come on a few days after replacing the ECM relay, or are they connected. What could be the issues? Thanks.

deermjd · Postby **deermjd** » Mon Feb 27, 2012 6:16 am

Probably just coincidence but that sucks that you've had back to back problems. For the cats, check out rock auto.com or some local part stores for cats a fraction of the cost of Oem.

drumminlogan · Postby **drumminlogan** » Tue Feb 28, 2012 10:57 am

Is it common that both cats would signal an error at the exact same time?

deermjd · Postby **deermjd** » Tue Feb 28, 2012 11:30 am

Don't think so.

JAHBLESSINGS · Postby **JAHBLESSINGS** » Tue Feb 28, 2012 2:20 pm

go to the dealer and bitch that your ses light is on after you left.

ECM Relay Replaced, Now P0420 Error

ECM Relay Replaced, Now P0420 Error

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