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).
Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit
Feel free to contact us in this DTC P0138 code link, if you need additional details.
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