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p0171

  1. O2 Sensor Readings and P0171 Code

    DIY - Do It Yourself / Tech Tips
    Year: 2007 Engine: 4.0L V6 Mileage: 93,000 My service engine light recently came on, a bit after I noticed that my truck was idling erratically. So I pulled out my code reader and got a P0171 code (System too lean bank 1). After some further exploration, my initial thoughts are a faulty...
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