P0036Low SeverityEmissions

HO2S Heater Control Circuit (Bank 1, Sensor 2)

What This Means

The heater circuit for the downstream oxygen sensor on bank 1 has malfunctioned. This is the post-catalytic converter sensor used to monitor converter efficiency.

Common Symptoms

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

Common Causes

Failed heater element
Blown heater fuse
Wiring or connector issue
PCM relay failure
Corrosion

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.