P0037Low SeverityEmissions

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

What This Means

The downstream oxygen sensor heater on bank 1 is reading low voltage. The heater circuit likely has a short to ground preventing proper operation.

Common Symptoms

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

Common Causes

Short to ground in wiring
Failed heater element
Corroded connector
Damaged harness
Ground fault

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.