check engine light

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Jun 9, 2011

moonliteshawn

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Joined: Jun 2011

Posts: 24

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From: alberta

check engine light

i have an 07 ranger 4.0 fx4 and am having a problem with my check engine light coming on it a po71 code lean bank 1 i changed fuel pump filter o2 sensors and cleaned the maf can anyone help me diagnose and fix this problem

Jun 13, 2011

Murphy

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Joined: Jan 2011

Posts: 129

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From: West Deptford NJ

P0171? Bank 1 lean?

You replaced stuff that affects both banks, not just one. Look for a vacuum leak, or something else localized to bank one.

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