TorqueMech OBD Code Guide

P0059 - HO2S Heater Resistance (Bank 2 Sensor 1)

The PCM detected a heater-control or heater-resistance problem in the heated oxygen sensor circuit, which can delay sensor warm-up and emissions readiness.

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Code Overview

The PCM detected a heater-control or heater-resistance problem in the heated oxygen sensor circuit, which can delay sensor warm-up and emissions readiness.

Common Causes

Failed O2 sensor heater element
Blown fuse or relay issue
Harness damage near exhaust
Poor power or ground to the heater circuit

Diagnostic Steps

Inspect the O2 sensor harness near the exhaust for heat damage
Check the heater fuse, relay, and power supply
Measure heater resistance and compare against spec if available
Verify the PCM can control the heater circuit before replacing the sensor

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