Component Inspection

Visually/physically inspect following items:
1. Ensure that the sensor is securely installed
2. Check for corrosion on terminals
3. Check for damaged wiring
4. Repair as necessary and go to next step
Warm up the engine to normal operating temperature and check that HO2S signal is active.
Connect scan tool and monitor the "O2 SNSR VOLT.(B1/S2)" parameter on the scan tool data list.
Test Condition: Ignition "ON" & Engine "ON" & In Idle ("Closed Loop") condition

Specification: Above 0.6V

Fig 1: scan tool Data Display
Courtesy of KIA MOTORS AMERICA, INC.

A: Open in Signal circuit: Approx. 0V

B: Normal value with idle after warm up: Above 0.6V
Is sensor data near the specified value?
YES
- Check for poor connection between PCM 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
- 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.