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P2A01 MERCURY

P2A01 MERCURY - Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 2

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

  • Faulty Rear Heated Oxygen Sensor Bank 1
  • Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Tech notes

    Replacing the rear O2 Sensor bank 1 usually takes care of the problem.

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust
  • P2a01 Mercury Description

    The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) for an out of range low voltage concern. The P2A01 code sets if the HO2S voltage is out of range low for a calibrated period of time.
    OBDII Code P2a01 Mercury - Oxygen Sensor Circuit Range/Performance Bank 1 Sensor 2 - AutoCodes.com

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