P0044

Описание

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

Частые симптомы

• Possible secondary O2 sensor overheating
• Check Engine Light
• Potential secondary sensor damage
• Erratic secondary emission functions
• Possible blown secondary heater fuse

Возможные причины

• Short to power in secondary heater circuit
• Failed secondary O2 sensor internal short
• ECU secondary driver circuit malfunction
• Secondary wiring harness short to 12V
• Aftermarket secondary sensor issues

Диагностика

1. 1. Test secondary heater circuit for shorts to power
2. 2. Check secondary O2 sensor heater resistance
3. 3. Inspect secondary wiring harness
4. 4. Test ECU secondary heater control
5. 5. Check for aftermarket secondary sensors

Решения по ремонту

• Repair shorted secondary heater wiring
• Replace faulty secondary oxygen sensor
• Remove interfering aftermarket components
• Replace ECU if secondary driver failed
• Reset secondary system adaptations

Профилактика

• Use OEM secondary sensors for proper emission control
• Regular secondary wiring inspection
• Avoid modifying secondary sensor circuits