Thread: P0172 every Winter

I have 2001 gtp that is completely stock. The car has 220000 miles on it and still runs great. However, every winter it gives me a P0172. I can clear the codes and it will stay off for about a day or so. The car doesn't seem to run any different but my mileage does seem to drop a little. This is the 3rd winter ive experienced this. I have tried replacing all O2 sensors and the maf which seemed to help but the mil always comes back the same code and only that code. Anybody ever experience anything like this?

You should always identify the code and its meaning so everyone that sees it doesn't have to look it up themselves.

P0172 - Fuel Trim System Rich Bank 1

She's running rich.

I would start with cleaning your MAF, after 220k miles its probably dirty. Check for vacuum leaks.

Well check the things that determine fuel. Which is maf, map, and more simply engine temp sensor, and iat. Now why just bank 1 I'm confused about.

We only have 1 bank guy, just 2 sensors for that bank.

I thought it was 2 banks 1 sensor(for fuel trims) lol. I suppose banks are in reference to the sensors and not 1-2 being inline or v engine

Do you have a stock or open cone intake?

Why did you replace parts? MAF? Shotgunning parts at problem? That's an expensive way to guess how to fix something. I go with IAT sensor as the code appears when the TEMPERATURE changes, lol... Maybe Bad injector?

Well as always asked in repetitive maf failures, they can be over oiled and cause issus with contamination. I don't think it would get dirty in a couple days unless you serviced the filter again.

Injectors may be a good place to start. I've done injector balance tests which is ideal, but that requires special equipment.

the IAT wont change fueling at all. The IAT will only pull timing.