Heated Oxygen Sensor Heater Control Circuit Low (Bank 2, Sensor 3)
The P0063 code means the vehicle's onboard diagnostic system has detected: Heated Oxygen Sensor Heater Control Circuit Low (Bank 2, Sensor 3). This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $300 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Marginal fuel economy reduction
- Slow O2 sensor response during warm-up
- Emissions test may fail
Probable Causes (Ranked by Likelihood)
- Open O2 sensor heater element Very High
- Open circuit in heater wiring High
- Corroded sensor connector pins Moderate
- Blown heater fuse Moderate
Step-by-Step Diagnostic Procedure
-
Confirm P0063 with scan tool
-
Check heater circuit fuse
-
Measure voltage at O2 sensor heater connector on Bank 2 Sensor 3
-
Test heater element continuity
Frequently Asked Questions
What does P0063 mean?
P0063 indicates a low voltage condition in the heater circuit of Bank 2 Sensor 3, usually caused by an open heater element or broken wiring.
Is P0063 safe to drive with?
Yes, P0063 is a low severity code and does not affect driveability. It mainly impacts emissions during cold starts.
How do I diagnose P0063?
Start by checking the heater fuse, then measure voltage and resistance at the O2 sensor connector. If the heater element is open, replace the sensor.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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