Code Definition

P064E — ECM oxygen sensor processor performance error - Bank 2

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

About P064E

P064E 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 P064E is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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 P064E 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 fault code P064E is set when the Engine Control Module (ECM) identifies a performance issue with the processor that handles the oxygen sensor in Bank 2 of the engine. This diagnostic trouble code suggests a malfunction or inefficiency in the ECM's capability to interpret and process signals from the oxygen sensor on Bank 2. This is crucial for regulating the fuel-air mixture and controlling emissions. The issue could be related to the internal processing components of the ECM, the oxygen sensor's functionality, or problems in the wiring and connections of the oxygen sensor circuit.

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