P0040

Описание

O2 Bank-1 Sensor-1 Signals Swapped w/ O2 Bank-2 Sensor-1

Частые симптомы

• Incorrect fuel trim readings
• Check Engine Light
• Possible rich/lean conditions on wrong bank
• Erratic fuel control
• Cross-bank fuel trim issues

Возможные причины

• O2 sensor wiring harnesses crossed between banks
• Incorrect sensor installation after service
• Manufacturing wiring error
• Harness damage causing cross-connection
• ECU bank identification confusion

Диагностика

1. 1. Check O2 sensor wiring routing between banks
2. 2. Verify sensor installation locations
3. 3. Test individual O2 sensor signals
4. 4. Check for wiring harness damage or modifications
5. 5. Monitor bank-specific fuel trims

Решения по ремонту

• Correct crossed O2 sensor wiring
• Reinstall sensors in correct locations
• Repair damaged wiring harness
• Replace modified or incorrect harness
• Reset fuel trim adaptations

Профилактика

• Label sensors during removal
• Follow wiring diagrams during repairs
• Verify sensor locations after service