Rear 02s/CEL

[MO1182]

Hi 6G forum,

I splurged for the KOOKS green cats on my 350 to avoid any engine lights. I ran them on my 500 for years with no issues however I have popped a couple 0430 code in the last few days while doing off road driving. I know people have had good luck with the o2 Fowlers or the mini cats but I’m curious if that does anything to the fuel mixture and if a retune would be required if I use one of those methods to eliminate the cel.

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[K4fxd]

No tune required

 

[NTXChris]

The rear O2s are just there to monitor cat efficiency, so whether you replace the cats or install foulers/extenders, you wont need a new tune.

 

[MO1182]

The rear O2s are just there to monitor cat efficiency, so whether you replace the cats or install foulers/extenders, you wont need a new tune.

Awesome, thanks! I had thought that but then somebody mentioned to me the rears now might have a play with AFR so it made me wonder.

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