Secondary HO2S Circuit 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 CIRCUIT MONITOR OPERATION
| DTCs | P0137 (for bank 1) / P0157 (for bank 2) |
| Monitor execution | Continuous |
| Sensors / components OK | IAT, ECT, MAF, TP, Barometric pressure, Primary / Secondary HO2S, Secondary HO2S heater |
| Monitoring Duration | 30 s |
SECONDARY HO2S CIRCUIT MONITOR OPERATION
| DTCs | P0138 (for bank 1) / P0158 (for bank 2) |
| Monitor execution | Continuous |
| Sensors / components OK | Secondary HO2S heater |
| Monitoring Duration | 3 s |
Enable conditions
SECONDARY HO2S CIRCUIT MONITOR ENABLE CONDITIONS
| Parameter | Minimum | Maximum |
|---|---|---|
| P0137, P0157 | ||
| Fuel feedback mode | On | |
| Dual feedback mode | On | |
| ECT | 110 (230) °C (°F) | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa | |
| Secondary HO2S heater operation time | 24 s | |
| Misfire | No DTC | |
| EGR system monitor | No DTC | |
| Fuel system monitor | No DTC | |
| P0138, P0158 | ||
| Battery voltage | 11 V | 16 V |
Typical malfunction thresholds
SECONDARY HO2S CIRCUIT MONITOR TYPICAL MALFUNCTION THRESHOLDS
| P0137, P0157 |
| Pull-up voltage ≥ 4.5 V |
| HO2S voltage < 0.05 V |
| P0138, P0158 |
| HO2S voltage > 1.2 V |