DTC P0140: HO2S (REAR) NO ACTIVITY Kia Sephia I рестайлинг

Heated Oxygen Sensor (HO2S) (rear) circuit no activity detected code may be set by

1. Low fuel level.
2. HO2S sensor (rear) malfunction.
3. Open or short circuit between PCM connector C254 terminal No. 10 and HO2S sensor terminal No. 1.
4. Open circuit between PCM connector C254 terminal No. 8 and HO2S sensor terminal No. 3.
5. Intake air system, fuel system ignition system malfunction.

1. Check HO2S (rear) and PCM connections. Repair as needed. Go to next step.
2. Check PCM pin voltage at connector C254 terminal No. 10. See «PIN VOLTAGE CHARTS»(ref-25101) article. If voltage is okay, go to step 6). If voltage is out of specification go to next step.
3. Disconnect HO2S (rear) connector. Check continuity between PCM connector C254 terminal No. 8 and HO2S sensor connector terminal No. 3. If continuity exists, go to next step. If continuity does not exist, repair wiring.
4. Check continuity between PCM connector C254 terminal No. 10 and HO2S sensor connector terminal No. 1. If continuity exists, go to next step. If continuity does not exist, repair wiring.
5. Ensure fuel injectors, fuel pressure regulator, MAF sensor, ECT sensor, ignition and intake are working properly. Repair as needed.
6. Clear code. Recheck codes. If code returns, replace PCM. If code does not return, problem is intermittent.