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Home >> Hyundai >> 2021 >> Veloster N Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 3) >> DTC P0037-00: HO2S Heater Control Circuit Low (Bank 1/Sensor 2) >> Wiring Inspection >> Control Circuit Inspection
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Control Circuit Inspection

Check Item Specifications Prerequisite condition Terminal (+) Terminal (-)
Control Circuit - Voltage Approx. 2~3V
  1. Disconnect Rear HO2S connector
  2. Ignition SW "ON"
Control terminal of HO2S Heater Harness Chassis GND
  1. Is voltage within specification?

    YES 

    NO 

    NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.