P0055

Описание

HO2S Heater, Resistance Bank 1 Sensor 3 (PCM)

Частые симптомы

• Extended secondary O2 sensor warm-up
• Check Engine Light
• Possible secondary emission function delays
• Delayed full emission system operation
• Reduced secondary emission performance

Возможные причины

• Secondary heater element resistance out of specification
• Aging secondary O2 sensor heater
• Partial secondary heater element failure
• Corroded secondary sensor connections
• ECU secondary resistance measurement fault

Диагностика

1. 1. Measure secondary O2 sensor heater resistance
2. 2. Compare with manufacturer specifications
3. 3. Check secondary connections for corrosion
4. 4. Test secondary heater circuit operation
5. 5. Verify ECU secondary resistance measurement

Решения по ремонту

• Replace secondary oxygen sensor with bad resistance
• Clean or repair secondary connections
• Replace faulty secondary wiring
• Replace ECU if secondary measurement faulty
• Reset complete emission system

Профилактика

• Use correct secondary O2 sensors
• Protect secondary sensor wiring
• Regular complete emission system checks