Hi I recently purschased a 2006 cobalt ss 2.4 non supercharged, the guy we bought t from explained here was a cel on and it was pulling a code for bank one running to lean, i thru it on a scanner my friend has and pulled the same code the guy said he has had it in the shop and they can’t figure it out he had car for 9 years starting at 40,000 km and it currently is sitting at 194,000 ! It is causing the transmission to shift hard from p to r and then from n to d and while accelerating from first to second gear auto ! Now I have looked at the maf it looks clean and no obstruction filter is clean I looked at all the wiring to the maf and o2 sensor all look good! So I am wondering what other procedures you guys would suggest to fix problem, car is in amazing shape , motor doesn’t miss a beat, from my research the transmission is doing this cause d by this code, and recently the tc light has come on with a code stating system off, that information incorrectly stored! Any help would be greatly appreciate!

Ive had this happen. Is there and O2 code pulling too for your sensors? It will run Bank one and Two and say high voltage sometimes. Check your Intake and exhaust solenoids located on the top of the engine if your facing it on the left. Change them, clear the code, run it till all monitors are run through and it “should” fix the problem.
I’d also check your tranny fluid too just to be sure. No dipstick but there’s a plug on the case you can use to check it, very easy after you jacke it up. Check it on four jacks though and engine running. Good luck with your slowbalt