P0163powertrain
P0163 – O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
What does P0163 mean?
P0163 is a generic (standardized) OBD-II diagnostic trouble code in the Powertrain category. Its definition is: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3). Powertrain codes (P-codes) relate to engine, transmission, and drivetrain systems. These are the most common diagnostic trouble codes.
Code breakdown
SystemP — Powertrain
TypeGeneric (standardized SAE / OBD-II code — same meaning across most manufacturers)
SubsystemFuel and air metering
Common symptoms
- Check engine / malfunction indicator lamp (MIL) is illuminated
- Possible reduction in engine performance or fuel economy
- Engine may run rough, hesitate, or stall in some cases
- Vehicle may enter a reduced-power ‘limp’ mode for certain faults
How to diagnose
- 1Read all stored trouble codes with an OBD-II scanner and note any that appear alongside this one.
- 2Research this specific code for your exact make, model, and year, as repair details vary.
- 3Inspect the wiring, connectors, and the component named in the code definition for damage or corrosion.
- 4Test the related sensor or actuator against the manufacturer’s specifications.
- 5Clear the code and road-test to confirm whether it returns.
Severity varies by code and vehicle. Some codes are minor, while others can affect drivability or safety. When in doubt, consult a qualified technician.
Related codes
This information is provided for general reference only and may vary by manufacturer, model, and year. It is not a substitute for professional diagnosis or repair.