TechShop's Tool Minute: DTCs P0171 and P0174

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.

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.

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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