LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Kia >> 2004 >> Rio Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Fuel System & Fault Isolation >> DTC Troubleshooting >> DTC P0137: Ho2S Circuit Low Input (Bank 1, Sensor 2) >> Inspection/Repair >> Component Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Component Inspection

  1. Warm up the engine to normal operating temperature and check that HO2S signal is active.
  2. Connect Scantool and monitor the "O2 SNSR VOLT. (B1/S2)" parameter on the Scantool data list.
    1. Test Condition: Ignition "ON" & Engine "ON" & In Idle ("Closed Loop") condition
    2. Specification: Above 0.6V
  3. Is sensor data near the specified value?

    YES

    1. Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure

    NO

    1. Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
scientia non olet · About LEMON Manuals