P0063Low SeverityEmissions

HO2S Heater Circuit Low (Bank 2, Sensor 3)

What This Means

The oxygen sensor heater at bank 2, sensor 3 is reading low voltage. The heater circuit has a short to ground condition.

Common Symptoms

Check engine light on
No drivability symptoms
Increased emissions
Emissions test failure

Common Causes

Short to ground
Failed heater
Wiring damage
Connector corrosion
Ground fault

Estimated Repair Cost

$100 – $400

Parts and labor (varies by vehicle and location)

Difficulty:Easy

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.