P0056

Описание

Heater Oxygen Sensor-2 Bank 2, Control Circuit

Частые симптомы

• Delayed bank 2 catalyst efficiency monitoring
• Check Engine Light
• Possible bank 2 catalyst efficiency codes
• Extended warm-up for bank 2 emission tests
• Reduced bank 2 emission system performance

Возможные причины

• Failed bank 2 downstream O2 sensor heating element
• Open circuit in bank 2 downstream heater wiring
• Blown bank 2 downstream heater fuse
• Corroded bank 2 downstream electrical connectors
• ECU bank 2 downstream heater control fault

Диагностика

1. 1. Check bank 2 downstream O2 sensor heater fuse
2. 2. Test continuity in bank 2 downstream heater circuit
3. 3. Measure bank 2 downstream heater element resistance
4. 4. Check voltage at bank 2 downstream O2 sensor
5. 5. Inspect bank 2 downstream wiring and connectors

Решения по ремонту

• Replace faulty bank 2 downstream oxygen sensor
• Repair open bank 2 downstream heater wiring
• Replace blown bank 2 downstream fuse
• Clean corroded bank 2 downstream connectors
• Replace ECU if bank 2 downstream heater control failed

Профилактика

• Regular bank 2 downstream O2 sensor maintenance
• Protect bank 2 downstream wiring from exhaust heat
• Use OEM quality bank 2 downstream sensors