Recently I got a check engine light and got it scanned and got the codes P1273 & P1283. I understand it has something to do with the o2 sensors but I want to clarify. Could this just be because I'm running extremely lean? I recently put on a TopSpeed True Dual. Could that have leaned it out do much to cause a CEL?

My car:
2004 5at
68,xxx miles
Oil just changed, all other fluids checked

MD 5/16 spacer, aem cai, Headers, berk test pipes, and the true dual exhaust. ( test pipes have been on since April and never gave me a CEL until this exhaust was put on. )

I plan to have the car dyno tuned in February

So..
1. Will this cause a problem between now and my tune?
2. What could be done to fix this?

Any help is appreciated!

 

1273 and 1283 imply that the A/F has shift to the lean side of the scale. 1273 for Bank 1, 1283 for Bank 2.

Could be from intake air leaks, low fuel pressure or problem with injector(s). Could also be bad O2 sensors but it's unlikely both went out at the same time.

 

So you don't think this is from the new exhaust? (if I put my stock exhaust back on would it go away?)

Guess I'll take it to the dealer sometime soon..

 

It shouldn't be from exhaust unless you have some huge leaks that were throwing the O2 sensors off.

 

any idea what you think the dealership would charge to inspect/possibly fix?

 

Sorry for old bump. but i just got the p1283 code too.
any fix?

 

iirc it was related to test pipes. i put my oem cats back on the car when i was selling it and it went away

 

Well I have an actual vacuum leak in/on my intake manifold somewhere
think that could be the culprit?? because Berk HFC (that i just installed) are said to not throw code?

 

Vacuum leak could be the culprit yes.

However some HFCs do throw cels after a while. How long have you had them on the car? Over time the cat goes bad and one way you can tell is if you have it off the car, shake the cat back and forth pretty hard... The cat inside shouldn't be moving or anything at all.

 

Ive had them on for 4 days.... hah