P0038Low SeverityEmissions

O2 Sensor Heater Circuit High Voltage (Bank 1, Sensor 2)

What This Means

The downstream oxygen sensor heater on bank 1 is showing higher voltage than expected, indicating a possible short to battery voltage in the heater circuit.

Common Symptoms

Check engine light on
No drivability issues
Higher emissions
May fail emissions test

Common Causes

Short to power in circuit
Failed O2 sensor
Wiring damage
Connector fault
PCM issue

Estimated Repair Cost

$100 – $350

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.