Misfire– If the air-fuel mixture has gotten too far from the 14.7:1 sweet spot, this can cause your Buick Encore to misfire.Mileage- may or may not suffer depending on how much the air-fuel mixture has changed.For most people, the first sign that anything is wrong is the check engine light. There aren’t usually any drivability issues associated with P0171. If your vehicle has an inline four or six, there’s only one bank of cylinders. You only need to concern yourself with this if there are two cylinder heads. Bank 1īank 1 is the side of your Buick Encore’s engine with the first cylinder. It also throws the code P0171 to let you know it has done this. The vehicle’s PCM will add more fuel to the mixture to bring the air-fuel mixture where it needs to be for optimal combustion. The code is thrown when the oxygen sensors detect the air-fuel mixture is “lean” (too much air or not enough fuel).
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