Bank 2, too lean

[Cubieman]

This is expected and normal with the HJS Supersprint catalysts. Many people here have posted with the same issue, always steady RPM highway driving. Delete the cat efficiency codes and don’t worry about it. The car is just telling you the truth — your catalysts aren’t working as well as the ones that come on the car from the factory. They are race cats after all.

Ok, so this is not in reference to the pre-cat O2's? I figured it was, I believe I have my post cat O2's "deleted" but I'll have to double check.

I drove around town last night with my WB O2 and it seemed OK (hovering around 14.7), but yesterday was a track day and only my 2nd, so the engine saw different conditions than usual. However the first time I had it on the track this issue did not arise.

[repoman89]

This is expected and normal with the HJS Supersprint catalysts. Many people here have posted with the same issue, always steady RPM highway driving. Delete the cat efficiency codes and don’t worry about it. The car is just telling you the truth — your catalysts aren’t working as well as the ones that come on the car from the factory. They are race cats after all.

edit: mixed up my codes, never mind

[Cubieman]

Posted in the dumb question thread but wanted to see if I could get a few more ideas.

Got my very first "service engine soon" light today after 5 years, it was a P0174 (bank 2 too lean). The code popped up on the interstate comming back from a track day.

I had a cheap OBD Bluetooth scanner/App and cleared the code while driving and it never came back driving over an hour home on the interstate and through town.

I have a CSL tune/MAP sensor, when the CSL airbox was put on 3 years back all new boots were used with OEM clamps, OEM CSL hoses were used, I even put new air rail orings in, new pre-cat O2 sensors were installed in the same time frame along with having my injectors sent out to RC for cleaning.

With the CSL tune in mind what else should I be checking for besides an air leak? I have a WB O2 sensor in bank 2, so I'll have to hook up testo and check that out sooner than later.