May 112015
 

codes 1131 1151 truck is running rough and sometimes wont start

  One Response to “2002 f150 4.2 motor”

  1. Through the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

    P1131 Ford – Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

    Possible causes
    – Faulty Oxygen Sensor
    – Vacuum leak affecting bank 1 only
    – Fuel injector problem bank 1
    – Check for cylinder misfire on bank 1
    – Engine mechanical condition

    P1151 Ford – Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2

    Possible causes
    – Faulty Oxygen Sensor
    – Fuel pressure high or low
    – MAF sensor dirty/defective
    – Vacuum leak on engine
    – Leaking fuel injector or fuel pressure regulator
    – Faulty Powertrain Control Module

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