I got my tune about 3 weeks ago and after about 200 miles I get this code: P2A04 O2 Sensor Circuit Range/Performance. I asked Nelson to delete my rear O2s when I ordered my tune. Any ideas on what this could be or maybe he just didn't delete the rear O2s?

 

I just took the cats off an 05 ECSB 5.3L and got the same P2A04 code. It is listed in this document towards the bottom of page 8. http://redhat3.admarkonline.com/~sup...install-46.pdf

It is O2 Sensor Circ Range/Perf Bank 2 Sensor 2. It is not one of the NORMAL codes turned off when you delete rear O2s. I have never seen this code in the 2 tuner packages I use to edit PCMs. I'm thinking it may be something new added to the 05s since that is the same year you had it pop up on.

 

I am having the same problem, Have you been able to solve the problem

 

Holy thread necro... anyways...

I have 2 codes in my truck P2A01 and P2A04, I have longtubes with the rear O2s turned off, these codes are for sensor 2 on each bank, what else do I need to turn off?

 

Sounds to me like the rear sensors are still turned on and need to be turned off.



Edit: Sorry just ready this part I'll check EFI forum.

 

Nothing there. Wilde Racing had this problem back in 06 according to a post on HPtuners. Someone might see if he found a fix.

I did find a thread that said it's the Sensor Module.

 

Yeah, I looked at that stuff to... nothing definitive. Hopefully somebody will chime in with some more info.

 

I have this same issue with an 06 Tahoe. Anyone find a fix yet?