Secondary HO2S Monitor
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
Operation
SECONDARY HO2S MONITOR OPERATION
| DTCs | P0139 (Bank 1) / P0159 (Bank 2) |
| Monitor execution | Once per driving cycle |
| Sensors / components OK | MAF, TP, ECT, Primary / Secondary HO2S, Primary / Secondary HO2S heater |
| Monitoring Duration |
SECONDARY HO2S MONITOR OPERATION
| DTCs | P2A01 (Bank 1) / P2A04 (Bank 2) |
| Monitor execution | Once per driving cycle |
| Sensors / components OK | heater |
| Monitoring Duration | 120 s |
Enable conditions
SECONDARY HO2S MONITOR ENABLE CONDITIONS
| Parameter | Minimum | Maximum |
|---|---|---|
| P0139, P0159 | ||
| Dual feed back mode | On | |
| F/C mode duration time | 3.0 s | |
| ECT | 110 (230) °C (°F) | |
| Misfire | No DTC | |
| EGR system monitor | No DTC | |
| Fuel system monitor | No DTC | |
| P2A01, P2A04 | ||
| F/C mode duration time | 3.0 s | |
| ECT | 110 (230) °C (°F) | |
| Dual F/B mode time | 120 s | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa | |
| Misfire | No DTC | |
| EGR system monitor | No DTC | |
| Fuel system monitor | No DTC | |
Typical malfunction thresholds
SECONDARY HO2S MONITOR TYPICAL MALFUNCTION THRESHOLDS
| P0139, P0159 |
| HO2S switch time from 0.5 V to 0.2 V > 2 s |
| P2A01, P2A04 |
| HO2S max voltage - min voltage < 0.3 V |
| HO2S min voltage > 0.2 V |