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Home >> Kia >> 2014 >> Optima Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) (HEV) >> DTC P2270: O2 Sensor Signal Stuck Lean-Bank 1 Sensor 2 >> Wiring Inspection >> Ground Circuit Inspection

Ground Circuit Inspection

  1. Ignition "OFF".
  2. Disconnect Battery (-) terminal.
  3. Refer to appropriate service information and disconnect Downstream O2 Sensor connector.
  4. Measure resistance between Pin No. 2 (Ground) terminal of Downstream O2 Sensor harness connector and chassis ground.

    Specification :  Approx. below 1Ω

  5. Is measured value within specification?

    YES 

    NO 

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