[taxman9]

Hello - I recently purchased a 2007 Yukon which is just about to hit 100k miles. It has the 5.3 (non Flexfuel) engine. Ever since week one I've been having issues the the Service Stabilitrack /Traction Control Off warning light coming on and off as well as some sporadic CEL for some richness on ODB codes and can't figure it out but have been able to figure some thing sout by constantly analyzing the situation on when these things go off. I also just got an ODBII reader that I paired up with a Torque app on my cell phone to get some additional data tracking to figure this bugger out as I've scoured this site and the internet and can't find anything.

So here is some history
11/12 - Bought the vehicle with no history of issues and running well.
12/12 - first instance of Service Stabilitrak/Traction Control Off 3 chime warning lights while decelerating on an off ramp from expressway after driving for an hour with no issues. When accelerating after stopping there is a hard shift from 1st to 2nd gear and then the warning lights go off and everyting was back to normal. This issue happened sporadically from that point on (once or twice a week - this is driven daily).
12/12 - I installed a K&A air intake system. No issues for 2 weeks.
12/12 - Issues started back up and I took the vehicle back to the dealer and the warning wasn't on so they charged us $90 and we were on our way with thinking it was resolved. They couldn't find any error codes as from my understanding this Svc Stabilitrack warning combo doesn't hold records?? They said that the MAF sensor was unplugged which I don't believe is true as I took the whole air intake and throttle body apart and cleaned it before taking it in and double checked that everything was connected. Maybe I did space out but highly doubt it.

Pretty much ever since then this warning comes on while driving then hard shifts from 1 to 2 and goes away. I started patterning the occurrence and have made some observations. It almost always happens when I'm decelrating (meaning foot not on the accelerator). I normally do some coasting to stoplights and things to save on gas and I find it frequently does it then. But it will also happen when I'm stopped (still no foot on the accelerator). So I'm thinking it may have to do with the RPMs or Battery or electrical? The battery for what I can tell is the original 6 years old and I'm thinking of replacing with an AGM battery. I read somewhere if the battery is going bad that it can sometimes trip sensors on these vehicles. The CEL also comes on sometimes when the Svc Stabiltrack warning trips which made me also think it might be battery related. I checked the CEL codes and I'm getting a P0172 and P0175 codes on the readout.

Could they be related? Could the CEL codes be related to the K&N Air Intake?
Thougts? Anything?

Also as I mentioned before I got this Torque App which allows me to Scan. I scanned when the Svc Stabilitrac warning was off and got these results (Attachment1). Then reran the test while the warning was on (Attachment 2). Really don't know how to interpret these results - FAILS were


Test 1 -
MID:$61 TID:$40
- Heated Catalyst Monitor Bank 1
Max: 0 Min: 20,561
Test result value: 16,480
FAIL
----
MID:$90 TID:$c5
-
Max: -24,448ms Min: 20,528ms
Test result value: -14,960ms
FAIL


Test2:
MID:$10 TID:$a4
- O2 Bank 4 Sensor 4
Max: 41,088ms Min: 20,528ms
Test result value: 42,000ms
FAIL