I had my oil change today and had the car scanned. I have P0174 too.
mine goes on and stays for about 60-100 miles then goes off and CEL turns off.....
Then in a day or 2 it does it again and CEL comes on.
As a step 1. we sprayed the MAF with MAF cleaner, and CEL was OFF when i went to mech today.
PCM only said it first happened 2300 miles ago and bank 2 was at 18% when Bank 1 was at 25%
mech said when it goes BELOW 25% it kicks the CEL on.....
I am just monitoring mine for now as car runs fine and pulls hard, just stupid CEL goes on....
Lastly i have a long hill on my daily commute and lean into throttle to get up the hill and that is common place for CEL to come on.....(cruz 1500 RPM @2000 RPM up hill)
To the OP....did you get this resolved ? I just had a re-occurrence.....
Back in mid Sept i got my custom CAT-Back installed.
Today on about 5 mile in to my 30 mile commute to work the CEL came on. got P0100 and P0174.
Starting to wonder if the cold weather is making this happen ? Or the winter mix of gas ?
I think i will buy a 20gal treatment of Chevron until next oil change to have it looked at again.
-ALF out...
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