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code p 0171 refers to system too lean bank 1=== causes ---intake/ exhaust leak--AIR system---MAF/VAF sensor -fuel pressure /pump---injector/s---HO2S ( heated oxygen sensor, the one in the exhaust manifold before the cay converter
the cause is very often the HO2S sensor or a crack in the flexible section of the bank 1 exhaust pipe at the manifold
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