Code Definition

P0064 — HO2S Heater Control Circuit High (Bank 2 Sensor 3)

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

About P0064

P0064 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 P0064 is stored, the module has detected a signal or supply voltage higher than the expected operating range; 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 P0064 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 P0064 code signifies a high voltage condition in the heater control circuit of the oxygen sensor labelled as Bank 2 Sensor 3. This sensor is typically the third sensor in the exhaust system on Bank 2, often found in vehicles with advanced exhaust systems. The oxygen sensor's heater element is crucial for reaching its operating temperature quickly after the engine starts. The Engine Control Module (ECM) sets this code when it detects a higher than normal voltage in the heater circuit, which can hinder the sensor's effectiveness in accurately assessing the exhaust gas composition for proper ...

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