OBDII Code List

P0059 CHEVROLET - HO2S Heater Resistance Bank 2 Sensor 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
  • Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 harness is open or shorted
  • Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0059 Chevrolet Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
OBDII Code P0059 Chevrolet - HO2S Heater Resistance Bank 2 Sensor 1 -

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