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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 06-09-2011
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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
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Old 06-13-2011
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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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