[canajien]

awesome guys. It worked great. Thanks for all the help. I'll have the pics in the library soon.

I forgot to reset the pcm when I installed my cai, and it kept showing check engine for a week, but once I remembered the light went away and never came back

 

[mheideman]

Same thing happened when I did my CAI, Iridium plugs and Taylor Shortys.

 

[TREP R/T]

Any changes, it would be a good idea to pull the fuse. The funny thing is when I take my truck in for sevice, I remove some of my good such as the intake. When I reinstall it, everything is great. t=The last 2 times I removed it, I start the truck and the check engine light is on. WTF?!
It goes away when I reset the fuse. I never had this issue in the last year in a half of doing this ritual. All of a sudden, it just happens. I first thought something was wrong with the IAT sensor or the connection. Oh well!
I thought I would share that with you guys.

 

[RacinMason77]

well i reset the pcm and it worked for about 2 days and now the light is back on. Im not sure what to do now. And if there is a post cat sensor the wire must be ran through the exhaust cause I can't see one. Not to be redundant but im stumped.

 

[kenihemi]

From the 04 manual;

P2096-DOWN STREAM FUEL TRIM LEAN BANK 1
When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above (-7°C)20°F, altitude below 8500 ft and fuel level greater than 15%.

Set Condition: If the PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.
______________________________________________________________

There is one sensor before the cat and one after.

If the cutout is before the rear sensor, that is the problem.

Or, there is a problem with the rear sensor, like it was overheated with the install of the cutout or something.

The code is saying that there is a problem with the rear sensor readings.

If you are routing the exhaust out before the rear cat, that sensor cannot detect the correct mixture.

If the sensor was burnt out with welding heat, then that is the problem.

Don't know about 05's, but that is the case with the 04's.

Another thought, if you can't find a sensor at the rear of the cat, maybe the insaller removed and that is your problem.

That is why you got to learn to do this kind of stuff yourself.

 

[TREP R/T]

Good read!
Since you mentioned the rear sensor possibley being burnt or damaged by the welding, I would check all sensors in the exhaust. Check all the insulation on the wires. Its possible that he had a sh1tty ground or did not ground close to the point where he was making the welds causing more resistance.

 

[waldershrek]

Hey TREP, why do you take off some of your parts when you take it in for service?

 

[TREP R/T]

Just in case they give me a hard time. Everything is bolt on so really who cares.
I was more concerned over the cutout. I wasn't thinking on that one because the Y-pipe is a dead give away. The guys in the oil change bay have seen it all anyway.

 

[waldershrek]

My dealer told me that things like exhaust, CAI's, and programmers don't void the warranty and I had to take the truck back at 500 miles for a tranny part replacement and they saw all my stuff on there and didn't say anything and they still covered it. In fact....they told me they liked the sound of my truck. I guess it depends on the dealer.

 

[chipraider77]

I get the same code as do several of us running LT's Ive been told not to worry about it so i dont lol