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Home >> Kia >> 2020 >> Rio LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (6 Of 6) >> DTC P2251-00: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> System Inspection >> Air Leakage Inspection >> Inspection Procedure
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Inspection Procedure

  1. Refer to "Appropriate Service Information" and visually and/or physically inspect following conditions;
    • Vacuum hoses for splits, kinks and improper connections.
    • Exhaust system between O2 sensor and the Three way catalyst for air leakage.
    • EVAP system for leakage
    • PCV hose for proper installation
  2. Has any problems been found?

    Good 

    No Good