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Home >> Ford >> 2020 >> Explorer ST >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Engine Controls - Powertrain DTC Charts & Descriptions (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

DTC P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

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DTC DESCRIPTION P0134 - O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)

Description:  If the sensor signal value is not changing from the default value, the PCM commands an oscillating air fuel ratio attempting to detect some movement in the signal value. This DTC sets when the PCM is unable to detect movement in the sensor signal while the air fuel ratio is oscillating.
Possible Causes: 
  • UO2SPC circuit open
  • Damaged universal HO2S
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST DZ .