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Home › Genesis › 2021 › G70 3.3T, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis - 3.3L (8 Of 9) › DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor) › Wiring Inspection › Control Circuit Inspection

Control Circuit Inspection

  1. Ignition switch is turned "OFF".
  2. Disconnect HO2S(upstream) connector.
  3. Ignition switch is turned "ON".
  4. Measure voltage between VG terminal of the sensor harness connector and chassis ground.

    Specification  : Approx. 2~3V

  5. Measure resistance between VG terminal and other terminals of the HO2S harness connector.

    Specification  : Infinite

  6. Is HO2S display near the specification?

    YES 

    • Go to next step as below

    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.
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