Rear O2 Sensor Question
Thread Starter
Joined: Nov 2008
Posts: 115
Likes: 0
From: long island, new york
Rear O2 Sensor Question I recently installed ARH and a catted y this weekend. Before the install I read nearly everywhere that the rear O2's would have to be tuned out/use simulators. However, the y pipe had ports and my stock rear O2 sensors plugged rite up to the stock locations. No SES for two days until tonight. Does the increased flow or heat simply kill the rear O2 sensors over a short time? Tuning them out will not be a problem I'm just looking for clarification as to why rear O2's cannot be run despite the presence of ports in the catted y.
With a catted Y there should be no reason to tune out the rears. They are meant for making sure the cats are doing their job. The fact that yours are throwing problems isn't normal. What codes are you getting?
I've never heard of them not being able to be used on similar set-ups as yours which leads me to think there is some underlying cause as to why yours seem to be causing problems. Find out the code at a local auto parts store and let us know as that will help a lot in getting you in the right direction.
Launching!
Joined: Oct 2007
Posts: 289
Likes: 0
I have heard of guys having issues with the aftermarket cats still setting off you MIL. They are still quite a bit smaller than the factroy cats. Most guys still get the rear o2's tuned out. Most tuners just turn that stuff off, kind of like second nature.
Agreed, even with high-flow cats you usually have to tune out the rear o2 codes!
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
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