P0037

Описание

Heater Oxygen Sensor-2 Bank-1, Signal too Low

Частые симптомы

• Slow downstream O2 sensor activation
• Delayed catalyst efficiency checks
• Check Engine Light
• Possible P0420 catalyst codes
• Extended emission system readiness

Возможные причины

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

Диагностика

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

Решения по ремонту

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

Профилактика

• Maintain downstream sensor wiring integrity
• Protect downstream wiring from road debris
• Regular emission system checks