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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What Are the Symptoms of P0063?
- Check Engine Light on
- Marginal fuel economy reduction
- Slow O2 sensor response during warm-up
- Emissions test may fail
What Causes P0063? (Most Likely First)
- Open O2 sensor heater element Very High
- Open circuit in heater wiring High
- Corroded sensor connector pins Moderate
- Blown heater fuse Moderate
Can I Still Drive with P0063?
Yes, but fix soon. P0063 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
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.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0063?
-
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
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0063?
- 2008-2017 Honda Odyssey
- 2010-2019 Toyota 4Runner
- 2007-2016 Lexus IS350
- 2009-2018 Infiniti QX60
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