Learn what a P0138 code means, the most common causes, and the diagnostic procedure A P0138 Code is a generic trouble code defined as an O2 Sensor Circuit High Voltage (Bank 1 Sensor 2). Bank 1 is the part of the engine that houses cylinder number one. Sensor 2 is located after the catalytic converter. The sensor is used to check the oxygen storage capacity of the converter. The P0138 code means the Engine Control Module (ECM) has detected a high voltage signal (over 999 mV) from the downstream sensor … Read More

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