Does anyone know if there is a standard length for placing the bung hole for the after cat O2 sensor in a custom pipe build?
In a stock set up, the replacement Cats would come with pipe and bung holes already where they should be. But I had custom 2 1/2 pipe bending done to my 96 Yukon a few years back, from the exhaust manifolds to the tail pipe.
I never had codes before but right after having the custom job done I started getting bank 2 sensor 2 codes. Sometimes it says too rich, sometimes it says catalyst not functioning.
I had custom piping, two brand new high performance magnaflow cats and a hi-perf magnaflow muffler.
I changed the bank 2 sensor 2 O2 last week and so far no new codes, but that doesn't mean anything yet. This random code issue pops up sometimes 3 weeks later, sometimes 6 weeks later. Until I stop seeing it for maybe 2 months I wont be satisfied. I ordered 3 more O2's just for good measure and I hope to have them in this weekend.
But I did notice that the downstream O2 on bank 1 is further away from the cat than the downstream O2 on bank 2.
I assume the crossmember got in the way so it was a choice of 4 inches after the cat or 16 inches after the cat. Is there a standard distance before/after the cats for optimal O2 sensor readings?
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