P0057Low SeverityEmissions

HO2S Heater Circuit Low (Bank 2, Sensor 2)

What This Means

The downstream oxygen sensor heater on bank 2 is reading low voltage. A ground fault in the circuit is preventing proper heater function.

Common Symptoms

Check engine light on
No performance impact
Higher emissions
Emissions test failure

Common Causes

Short to ground
Failed heater
Corroded wiring
Connector damage
Ground circuit issue

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.