Code Definition

P0136 — O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0136

P0136 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0136 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0136 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0136 fault code is set when the Engine Control Module (ECM) detects a malfunction in the circuit of the oxygen sensor located in Bank 1, Sensor 2. This sensor is typically positioned in the exhaust system after the catalytic converter (downstream). The malfunction could be related to the sensor itself, such as failing to produce the correct voltage range, or it might be associated with the wiring or connectors that link the sensor to the ECM. The ECM uses the data from this downstream sensor mainly to monitor the efficiency of the catalytic converter. Issues in the sensor circuit can lead...

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