Hows it going guys got an 04 350z and i keep getting the code p1283 bank 1 sensor 2 lean. The code will come on when it wants sometimes with in 500+ miles sometimes with in 50 miles. The code will also shut off on its own with in a few days or so. The car is tuned on up rev with injen cold air intake, motordyne test pipes and full motordyne exhaust, motordyne iso thermal 5/16 spacer. I also have a wide band in the car on normal driving it is around 13.8-14.2 and when WOT is around 12.8-13.2 car feels like it has no loss of power what so ever. Going to check to see if 02 sensor is good this weekend but will like to get anymore input on what i maybe should check for. Thank you

 

Pretty sure that code is associated with the removed cats. Have your tuner block out the code via UpRev and you'll be fine. I have had that code on both my previous and current Z due to removing the cats..

 

I can not block the code due to Ma state inspection, why would it shut off on its own if it was a cat problem? And it comes on at random as well.

 

mine did the same thing.. idk. but it only happened after removing the cats.

 

Wouldnt it throw on both sensor 1 codes if it was due to cats?

 

not necessarily.. it would be weirder if both sensors went out at the same exact time.

 

Have u ever tried throwing ur stock cats back in to see if it fixed the problem?

 

Actually when i sold my old Z, i put it back to stock and threw the stock cats on and the code stayed off. Forgot all about that.. Yep.

 

Worse comes to worse ill throw them on comes to inspection day thanks i apprciate the input

 

Anyone els think it might be somthing els?

 

no.

 

Ok.