P0155: LEFT FRONT HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION Kia Sedona I

Note. Before performing any diagnostic test, refer toWARNINGS, CAUTIONS and NOTES under DIAGNOSTIC TESTS .

Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

Diagnostic Aids

Heater current of left front Heated Oxygen Sensor (HO2S) has continued to be 0.2-amps or less, or 3.5-amps or more for 6 second. Monitor runs once per trip. Check for following possible problems

1. Open or short between left front HO2S and Engine Control Module (ECM).
2. Incorrect left front HO2S heater resistance.
3. Faulty left front HO2S.