P0054

Описание

HO2S Heater, Resistance Bank 1 Sensor 2 (PCM)

Частые симптомы

• Delayed downstream O2 sensor activation
• Extended catalyst efficiency monitoring time
• Check Engine Light
• Possible slow catalyst efficiency checks
• Reduced emission system performance

Возможные причины

• Downstream heater element resistance out of spec
• Aging downstream O2 sensor heater
• Partial downstream heater element failure
• Corroded downstream sensor connections
• ECU downstream resistance measurement fault

Диагностика

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

Решения по ремонту

• Replace downstream oxygen sensor with bad resistance
• Clean or repair downstream connections
• Replace faulty downstream wiring
• Replace ECU if downstream measurement faulty
• Reset catalyst monitoring system

Профилактика

• Use quality downstream sensors
• Protect downstream sensor connections
• Regular catalyst system maintenance