I am having codes P0155 and P0480 and it keeps coming up. The truck runs like sh*t. My buddy just had his trucked tuned and his rear's turned off. He gave me one of his rears to try and nothing. Code still comes up. Do I need to disconnect the negative cable? I erased the codes but they keep coming up. What do I need to do? I would really appreciate any help!!!

 

P0155 is passenger side front O2 sensor needs replaced. Crucial to driveability.
P0480 has to do with your cooling fans. Not sure the details on fixing that one.

 

given that the 02 sensor your buddy gave you isnt bad, unplug the battery for about a 20 minutes, hook it back up, and it should correct itself.

i had a bad o2 sensor and replaced it, only to still have the check engine light still on, unpluged the battery, and it corrected itself. hope this helps, good luck.

 

The rears won't always work in the front.

 

The 4080 could be a fan relay going bad, or ECT sensor among other things

 

I'm interested how you even got the rears working on the fronts? My rear 02's use a different eletrical plug than the fronts.

 

oh chit i didnt see it was his pass. front that was bad, GMCTRK is right they are different plugs.

 

It would be nice to get a scan tool or some logging software on there to see that the r/f O2 sensor is reading and switching from rich to lean properly. The code is for the heater, which heats up the O2 sensor to allow it to read properly. Usually once the engine heats up, the exhaust charge should be warm engough to allow proper operation of the O2 sensor, unless of course you have long tube headers, then the exhaust may never see warm enough temps for the the O2 to operate as it should. Do you have LT headers that are steel and not coated? This could be your problem.

 

Yes I do have long tube headers. They are steel and not coated.

As for the plug working in the front, my buddy has an 04 SCSB and his rear plug only works in my front passenger side. My drivers side is different. Everything has been fine since I put the LT's on there. Ever since that day it has been hell. It runs really bad. Like its missing a cylinder or two.

It is now giving me codes, P0101, P0113, P0154, P0155, P0480, P0526. Could all of these be caused by just one thing. Monday I am taking it down to this guys shop and he is going to hook it up to a real machine and see what the hell is going on. Does anyone have any thoughts before I go out and spend some serious money. It would be greatly appreciated.

 

The first 2 codes are related to the MAF sensor, have you unplugged it recently? Not sure about the cooling fan codes and I don't know the description of the P0526 code. I don't see how the codes could be related, unless the MAF, O2 sensor, and cooling fans share a common ground or something like that. Has the PCM been unplugged recently? Maybe the connector isn't seated completely. How about the wiring, any broken, pinched, melted wires anywhere?