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Engine & warning lightsP0171/P0174 Codes: Lean Air-Fuel Mixture and How to Pinpoint the Leak SourceExplaining lean mixture codes P0171 and P0174, the difference between bank 1 and bank 2, and how to precisely locate an air leak.Fault codeP0171 — System too lean (Bank 1)P0171 means a lean air-fuel mixture. Learn the top causes like vacuum leaks and MAF sensor issues, with realistic repair costs.