P0031

Описание

Oxygen (Lambda) Sensor B1 S1: Heating Circuit, Signal too Low

Частые симптомы

• Slow O2 sensor activation
• Extended closed-loop delay
• Check Engine Light
• Poor cold driveability
• Increased warm-up emissions

Возможные причины

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

Диагностика

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

Решения по ремонту

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

Профилактика

• Maintain good battery health
• Protect O2 sensor wiring from abrasion
• Regular electrical system checks