OBD codes for running lean
 

I'm running out of ideas. I had an ecuTek tune back in august for my HFC's, exhaust, and Stillen intakes and everything was cool (everything was fine before having the tune as well.)

Back in October, I installed test pipes but did no re-tune so codes for banks 1&2 running lean which I expected.

Now I've swapped out my test pipes for high flows again along with new o2 sensors and it's still throwing those codes which confuses the hell out of me.

What is/are the actual code(s)? There's more than one lean code so it would help determine what to check.

Simple things to check/try is:
1. Look for leaks in the intake and exhaust from the MAF sensors all the way to the
primary O2 sensors.
2. Clean the MAF sensors.

p0123 p0223

Those aren't codes for running lean. They're codes related to the throttle position sensors according to google. Are all the wiring connectors plugged in and seated correctly?

Sorry I made this thread when I was half asleep. The codes are p2096 and p2098

What raises further questions is that the AFR while cruising is right around 14.1

Those are post-cat codes. IIRC, post-cat O2 sensors are not used for engine management - they are to check operation of cats. Shouldn't cause any problems as long as the pre-cat sensors are working properly - unless you need to pass an emissions test.

I need to pass an emissions test. No idea what to do. Any way to trick it?

Said in the first post that my car was already tuned for the HFC,CAI, and exhaust set-up. Swapped to test pipes for a few months now back to the same high flows. Still getting the same codes.

Trust me that was the first thing I saw when I searched and doesn't really apply too much to my situation.

AFAIK, there is no way to trick the system.

If nobody comes up with an answer soon, I'd hit the FSM.

A re-tune with a bit richer mixture might fix the problem.

Keep in mind that after you get things fixed you will have to go through several drive cycles (details in FSM) before the emissions system will report being ready.

fuuuck

This is really annoying because this is the exact same set-up I had it tuned on

I didn't catch that part. My only guess is that the sensors have deteriorated due to no cats. Can you monitor the sensor output?

Extend the A/F secondary O2 probes with Exhaust O2 extenders which are available at most local speed shops. Unplug battery to reset codes and you should be done.

If that fails; take it to a speed shop and bend over

I put on brand new o2 sensors when I put the cats back on.

I'm going to try cleaning my MAF's and injectors

I have O2 spacers sitting around. What do you mean by A/F secondary O2 probes? The upstream O2 sensors?

I believe I have found the problem. I was lurking on the GT-R boards and this is a common thing for them. The cause is usually an exhaust leak

Found the problem and I'm slightly ashamed of it.

http://i44.photobucket.com/albums/f2...s2m0mj0gb.jpeg

Sandwiched the gaskets with copper RTV and tightened the bolts to holy hell and no more codes

Thanks for the update. :tiphat:

I feel kinda stupid about this one

Thanks for keeping us in the loop DeliriousClam. Glad you figured it all out.

Sorry to revive this thread, but I'm having the same issue. Wondering if a leak could be the cause. How did you find the leak exactly?

I like to take the tube from a roll of paper towels, hold one end to my ear, and move the other end around until I find the source. Be careful when working around moving parts.

I just got these 2 codes myself (2096 and 2098)on my Infiniti qx70, I cleared it with OBd reader, but will look deeper into it this weekend.

Same setup, ark exhaust with test pipes