so a few months ago i was retuned by byt, i came from trifecta. shortly after being retuned i threw a cel, p0141. i would clear it and it just kept coming back. about 2 weeks ago i finally got around to replacing my rear o2 sensor. that code never came back. but now i'm getting p0131. i looked for shorts and what not in the front o2 sensors wiring and couldn't find anything. i replaced that sensor to no avail. i cleaned my maf and air filter and this code keeps coming back. idk what else to look for. ive searched quite a bit and cant find any answers. what else could be the problem? btw, i dont notice any performance issues when i throw this code, my car is still a beast. haha.

 

bump

 

Lean code. Could be cause by an exhaust leak.

 

I second that it could be an exhaust leak. I had a small pin hole leak near my o2 sensor so it was sucking in air and was reading lean, can't remember the code i got.

 

How would i go about trying to pinpoint an exhaust leak?

 

I took it to my exhaust guy and he used a rubber flex tube and put one end to his ear and moved the other end around the welds on the exhaust and when he heard a hissing noise he welded it until there was no noise. Hope this helps

 

Now yesterday i threw another code, p0137. This kinda confirms the exhaust leak theory now, doesn't it?

 

from your post,sounds like you didn't get this code till after you was retuned. when you had trifecta,there was no cel...i would look there(your new tune)

 

When i had trifecta i remember throwing a code or 2 and i just had Vince disable them. I don't remember what codes they were tho

 

Baby powder is the only thing I've used to successfully find an exhaust leak. It makes a freaking mess, though. You can just replace the exhaust manifold and both crush gaskets to be sure, but that will be some work.

 

Baby powder? Do explain.

 

While the car is running, you sprinkle baby powder down around the exhaust parts. I used a turkey baster. When you have a leak, you'll see it shoot the baby powder a different direction. Smells like hell and makes a mess, though.