Error code
OBD2 P0163
OBD2P0163
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
O2 Sensor Circuit Low Voltage.
Severity
moderateCan drive, but emissions may be affected.
Summary
P0163 indicates low voltage in the heated oxygen sensor (HO2S) circuit for Bank 2 Sensor 3.
Common Causes
- Faulty HO2S sensor
- Wiring or connector damage
- Exhaust leak between TWC and HO2S
Diagnosis
- Check fuses and wiring for issues.
- Inspect connectors for damage or corrosion.
- Use a stethoscope to check for exhaust leaks.
- Test circuit continuity and resistance.
- Compare live data from HO2S and AFR sensor.
Fixes
- Replace faulty oxygen sensor if necessary.
FAQ
What does P0163 mean?
P0163 indicates low voltage in the heated oxygen sensor circuit for Bank 2 Sensor 3.
How do I diagnose P0163?
Check fuses, wiring, connectors, and exhaust leaks. Test circuit continuity and resistance.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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