P0052Low SeverityEmissions

HO2S Heater Circuit High (Bank 2, Sensor 1)

What This Means

The upstream oxygen sensor heater on bank 2 is reading high voltage. This usually indicates a short to power in the heater circuit wiring.

Common Symptoms

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

Common Causes

Short to power
Failed sensor heater
Wiring damage
Connector issue
PCM output 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.