2005 Chevrolet Cobalt Codes C0561 & U2100

Thanks for the advice, I get the reaing from the OBC Scanner but I dont get a ABS/Traction ligth on my DASH, can this error be cleared by the dealer or can it be done another way. Is running the car dangerous?

Thank you for ur good advices. Now after a few days I get another CEL again, took it to Autozone
Again and this time it came up with a P0171 code, did some reading could be MAF dirty or malfunction, I had already replace it about a month ago, I have not tried the Fuel FIlter yet cause I have not change it since I got the car about 2 yrs ago and have not tested yet the fuel pressure to c if I have from 50-60 PSI also going to chk my Intake Manifold for leaks or loosen, dont think is the bank1 sensor already change it about 1 week ago when I got the P0172. I am going for the Fuel filter first and change it, if it coninues with the CEL then test the fuel pressure, Do you think that I am doing the correct processing for the fix of the P0171.

Thank you. Just trying to save money on DIY and learning some more.

Your are referring to the grommets were the MAF is inserted, My is black and square with 2 screws to hold it down. I do have a CAI partial with the Air duct on it. Here is Pic of my CAI.

Yeah I checked the the grommets on the engine on the valve cover and they looked ok, only that there were a little bit lose, also tighten the screws on my air manifold were also lose and notice that inside of the manifold on the bottom there was some oil residue on it, I dont know if thats normal or not, my K&N filter is dry and not oily on it, still ligth on, all have to do now is check fuel pressure and injectors b4 I give up and just leave it like that, I mean the car runs smoothly with no problems except that CEL that wont shut off, well thanks for your good advice and I will keep on trying. Thank you.

I was reading back on this Webpage on past reviews and came up with this same code P0171 on this thread==>> https://www.2carpros.com/questions/chevrolet-cobalt-2005-chevy-cobalt-engine-check-p0171-code

I did change the MAF twice from the same Vendor on Ebay but I remember now on back march, 29, 2010 that I did buy that sensor en Oriellys and not on Ebay. Still my Car runs smooth with no problems but with that CEL P0171 on. Just wanted to let u know that I had that same problem on March 29, 2010.

Thank you.

I check that rubber lip around the throttle cause I also clean the throttle. I have not tested yet the fuel pressure I have not bougth a fuel pressure gauge, do you know where I can get one real cheap. Let you know afterwards if any changes on P0171. Thank you again.

Well I did have a P0172 code, first change The MAF sensor, CEL went off for a few then back on, I replace the o2 sensor bank1 and the CEL went off for a few days and then came back on but with P0171. Check for air leaks or anything to do with the air emision, check the gromment on the engine valve, clean the throttle and chk the rubber line on the throttle and tigthen everything on the engine valve and the manifold. Still had P0172 after I took it to Oriellys, they clear the codes on july 13,2013 when I got home I had just purchase a Full tank cap cause I also notice that the cap was not real tigth and that causes your CEL to turn on, well since july 13, 2013 until today that CEL has not come back on, so I guess that either it was the tigthen of the lose screws on engine or it must have been that fuel Cap isnt that really something. Like you said before that I problably had a leak somewhere, I have not done the fuel pressure but I do know I have to change my fuel filter, but for now the CEL does not come on, just wanted to keep you inform of my Codes P0172/P0171. Thanks again.

Hi, I just changed my fuel filter today which I think it was not changed since I purchase this car about 3 yrs ago. I also had a P0135 code, which is Oxygen sensor heat on bank 1 I know its not the fuse cause there is none on this car, so I just replace it. Just for your info: and thanks for all your good advice, not a mecanic but if I can DIY I will and sa ve money and learn.

Thankl you.