TechShop's Tool Minute: DTCs P0171 and P0174
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TechShop’s Tool Minute: DTCs P0171 and P0174

Grab your scan tool and let’s learn more about excess oxygen in the exhaust stream and P0171 and P0174 codes.

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Excess oxygen in the exhaust stream sets a P0171 (bank 1 lean) or a P0174 (bank 2 lean) code. Although bank 1 and bank 2 generally refer to V-block cylinder configurations with an oxygen sensor on each bank, some in-line engines split their exhaust manifolds to create a B1 and B2, each equipped with its own oxygen sensor.

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Grab your scan tool and meet us in the garage to learn more.

For our video on interpreting fuel trims, click HERE.

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