P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter
produces an
output signal relative to oxygen storage capacity of catalytic converter. 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
Hope help with this (remember comment and rates this).
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