[Official] "Do I need a tune with bolt-ons?" thread

[OhioYJ]

Originally Posted by BLK N-Z34

The car is now throwing the following codes:

P2096 - Post Catalyst Fuel Trim System Too Lean Bank 1

P2098 - Post Catalyst Fuel Trim System Too Lean Bank 2

I clear the codes and they come back in roughly 50 miles or so. They didn't come on within the first 150-200 miles after installing the ART Pipes though. I removed both O2 sensors before removing the original converters. The O2 sensors were both removed by hand with a wrench and a slotted O2 socket so they shouldn't be damaged. Now that I think about it I did put them back on but only hand tighten them.. that could be a problem? lol

My car has Berk HFCs on it, and threw those codes once before being tuned, and has since thrown those codes once since being tuned. I wasn't running lean before being tuned though (More here), I was running rich.

Torque spec I believe on the O2 sensors is 33 ft-lbs, so you could have achieved that with by hand. However that's honestly not one I deem critical, and I use a torque wrench for practically everything.

My car has only thrown those codes twice, and I just chalk it up to the HFCs, but it's been 5000 miles apart, so I haven't worried about it. If it does it again, I'll talk to the tuner. In your case with test pipes, they maybe causing this (since it reoccurs so quickly). The other possibility is an exhaust leak.