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  1. Too Lean P0171 - Ecoboost f150 crew 4x4

    F150 Ecoboost Problems
    I'm scratching my head as to what is causing this too lean code on my truck. 2013 F150 Supercrew 4x4 3.5 Ecoboost 74k miles. I've replaced the upstream O2 sensor and the PCV valve on the Bank 1 side, also replaced the MAP sensor by the air filter, I also cleaned the other two. Checked vacuum...
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