P0043

Описание

Heater Oxygen Sensor-3 Bank-1, Signal too Low

Частые симптомы

• Slow secondary O2 sensor activation
• Delayed secondary emission functions
• Check Engine Light
• Possible secondary system performance issues
• Extended warm-up for full emission control

Возможные причины

• Short to ground in secondary heater circuit
• Failed secondary O2 sensor heating element
• Low system voltage to secondary sensor
• Corroded secondary ground connections
• ECU secondary driver circuit issue

Диагностика

1. 1. Check battery and charging system voltage
2. 2. Test for shorts to ground in secondary circuit
3. 3. Measure secondary heater element resistance
4. 4. Inspect secondary ground connections
5. 5. Check ECU secondary heater control

Решения по ремонту

• Repair shorted secondary heater wiring
• Replace faulty secondary oxygen sensor
• Charge or replace battery if needed
• Clean and tighten secondary grounds
• Replace ECU if secondary driver failed

Профилактика

• Maintain secondary sensor wiring integrity
• Protect secondary wiring from road debris
• Regular secondary system electrical checks