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Guaynabo, PR

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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,

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