DTC Advanced Diagnostics: P0139: General Description
The powertrain control module (PCM) determines the responsiveness of rear secondary heated oxygen sensor (rear secondary HO2S (bank 1, sensor 2)) by monitoring the rear secondary HO2S (bank 1, sensor 2) output voltage change during the fuel cut-off control. If the changing of the rear secondary HO2S (bank 1, sensor 2) output voltage takes time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | - |
| DTC Type | Two drive cycles, MIL on |