Engine Light on my 2009 Yukon

[drseth]

I am on a trip out West in my 2009 Yukon with 113K miles. The engine light came on and I scanned it and the code said the bank one was rich. I was up and down long grades here in South Dakota when it came on. Been running regular gas but put premium in this tank.

I had replaced the spark plugs and O2 sensors at 1K. I reset the code. If it returns, what could it be?

 

[BG1988]

what was the exact code?


map sensors are sometimes flaky do they match on key on

(both the baro and map sensor?)

 

[drseth]

I should have screen shot the code before clearing it. The Yukon usually is on flat level roads in Virginia.

Will give the code if it pops up again.

 

[drseth]

what was the exact code?


map sensors are sometimes flaky do they match on key on

(both the baro and map sensor?)

P0175

 

[wsteele]

You already addressed a few of the possibilities. Others would be a dirty or flaky MAF (there are lots of YouTube videos on how to clean them, be careful), a clogged air filter or intake plenum, leaky fuel injector(s), fuel pressure issues (less likely oil your truck as the pressure management is pretty intelligent).

Good luck.

 

[OR VietVet]

What @wsteele said and does the owner's manual tell you to run regular fuel? I would never run regular fuel in these rigs. At least mid grade.

 

[BG1988]

P0175

dirty or leaky or bad fuel injector(s)

it can also be a clogged air filter or restriction in the intake