i'm lost. got an o2 sensor question

FRAN_12F · Jan 20, 2017

okay i have a 2004 dodge 1500 hemi. the thing is i've had codes for my upstream o2s and i finally changed them this past weekend. sweet right? cel went out no problems gas mileage went back up i was a happy camper. than driving the other day my cel came back on checked it and two new codes came up that i havent had before p0420 and p0430 the cats are below threshold. so my question is why all of a sudden since i changed my two o2s before the cats make these codes pop up or are my cats cashed? everything is stock. any help would be greatly appreciated thanks

BBRAM2500 · Jan 20, 2017

So my take on it was with the failed O2 you have now partly plugged your cat or the cat was plugged before but due to a bad O2 the pcm could not determine the fault as it could not read the O2

BBRAM2500 · Jan 20, 2017

On a side not a cat will almost never fail if an engine is running well the biggest killer of cats is silicone from the headgasket or a coolent system overheat next is running too much un burnt fuel threw them you can get a flush that has id say a 70 30 sucsess rate of cleanning up your cat its called cat clean but if that does not work you got 2 options replace the cat or gut it and deal with the cel

blackbeautyhemi · Jan 20, 2017

Gut them and get a custom tune to have the codes turned off.

i'm lost. got an o2 sensor question

FRAN_12F

Junior Member

BBRAM2500

Senior Member

BBRAM2500

Senior Member

blackbeautyhemi

Senior Member

Similar threads

Latest posts

Members online

Forum statistics

Share this page