P0138 02 Sensor Circuit High Voltage (Bank I Sensor 2) Trouble Code

P0138 O2 Oxygen Sensor Circuit High (B1S2)

Technical Description

O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.

The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Bank 1 is the side of the engine that contains the #1 cylinder.

 

Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms

There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

Causes

A code P0138 may mean that one or more of the following has happened:

Faulty O2 sensor Short to battery voltage in O2 sensor signal circuit High fuel pressure (not as likely)

Possible Solutions

Here are some potential solutions:

Replace O2 sensor Repair short to battery voltage in o2 sensor signal circuit

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