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Q: Injection cleaning on 2008 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Hi,
I am getting Check Engine Light, I used my scan tool and got his Error Code:
1- P0171 -- FUEL TRIM TOO LEAN (BANK 1)
2- P0174 -- FUEL TRIM TOO LEAN (BANK 2)

What happened I was driving and need to refill car with fuel, I used to fill it with Octane 95 Fuel, but at that time I were not able to find it so I fill it with Octane 91, after driving for two days this light appears and I got this Error code.

Could please advise if this is a serious problem or not.

Regards,

(1) Answer
First do a visual inspection for vacuum leaks like a hose disconnected,and make sure the hoses that go to the intake are connected.There was a service bulletin for these codes that had to do with running e-85 fuel on vehicles that are not flex fuel capable.If nothing obvious is found you will need to take the vehicle to a dealer for an accurate diagnosis.
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