P0064 HO2S Heater Control Circuit High Bank 2 Sensor 3

P0064 indicates a high heater control circuit for bank 2 sensor 3. The heater path is open, shorted to voltage, or above expected range.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace upstream sensors for a bank 2 sensor 3 heater high code; confirm the exact downstream circuit first.

Symptoms of P0064

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0064

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check heater signal voltage, feed, ground path, open circuits, short-to-voltage faults, connector fit, and sensor heater resistance.
Inspect exhaust-side harness routing, loose terminals, melted insulation, connector corrosion, and shared heater circuit problems.
Verify bank and sensor position before replacing the oxygen sensor or repairing the heater wiring.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.