P2A00 FORD - O2 Sensor Circuit Range/Performance Bank 1 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Faulty Front Heated Oxygen Sensor Bank 1
  • Front Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks
  • Tech notes

    There is a factory service bulletin for the following Ford models:
    2011-2012 F-Super Duty
    2011-2012 Ford F-Super Duty Factory Service Bulletin OBDII Code P2A00

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P2a00 Ford Description

    The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates the voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
    OBDII Code P2a00 Ford - O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 - AutoCodes.com

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