DTC P0154: LEFT FRONT HEATED OXYGEN SENSOR CIRCUIT NO ACTIVITY DETECTED Kia Optima I рестайлинг

Note. Before performing any diagnostic test, refer toWARNINGS, CAUTIONS and NOTES in 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

Engine Control Module (ECM) monitors left front Heated Oxygen Sensor (HO2S) once per trip and will set a code when air-fuel ratio is forcibly changed (lean to rich to lean), HO2S signal does not provide response within 1.28 seconds.

Check for following possible problems

1. Open or short between left front HO2S signal terminal and ECM.
2. Contaminated, deteriorated or aged left front HO2S.
3. Misplaced, bent, loose or corroded left front HO2S or ECM connector terminals.
4. Faulty left front HO2S.