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Acura DTC

Acura DTC P0138

Manufacture

Acura DTC

Code

P0138

Definition

Rear Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage

Description

The execution time is continuous and the duration time is 2 seconds or more. The rear secondary HO2S output voltage is 1.270 V or more for at least 5 seconds. After current is applied to the rear secondary HO2S heater, if the rear secondary HO2S output continues to exceed the upper limit used during feedback control, a malfunction is detected and a DTC is stored. NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot.

Cause

  • Poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCMOpen circuit between the PCM and the secondary HO2S (Sensor 2)Faulty (Secondary HO2S (Bank 1, Sensor 2)Faulty PCM

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