OBD-II codes P0172 and P0174 indicate a rich fuel condition in both the bank 1 and bank 2 of the engine. Common fixes include checking for vacuum leaks, inspecting the mass air flow (MAF) sensor for proper function and cleanliness, ensuring fuel pressure is within specifications, and examining the fuel injectors for leaks or malfunctions. Additionally, testing the oxygen sensors for proper operation can help identify underlying issues contributing to the rich condition. Addressing these components typically resolves the codes.
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