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Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 6) (PHEV) >> DTC P0300-00: Random/Multiple Cylinder Misfire Detected >> System Inspection >> Intake/Exhaust System For Restriction Or Leakage
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Intake/Exhaust System For Restriction Or Leakage

  1. Refer to "appropriate service information" and visually and/or physically inspect following conditions:
    • Vacuum hoses for splits, kinks and improper connections.
    • Positive crankcase ventilation valve for improper installation, damaged O-rings and malfunction.
    • Good PCM ground connections.
    • Contamination, deterioration, poor connection or damaged MAP Sensor and ECT Sensor harness.
  2. Has any problems been found?

    YES 

    NO