P0400-P0499
- P048C Exhaust Pressure Control Valve Position Sensor/Switch Circuit Range/Performance
- P048D Exhaust Pressure Control Valve Position Sensor/Switch Circuit Low
- P048E Exhaust Pressure Control Valve Position Sensor/Switch Circuit High
- P048F Exhaust Pressure Control Valve Position Sensor/Switch Circuit Intermittent/Erratic
- P0490 Exhaust Gas Recirculation “A” Control Circuit High
- P0491 Secondary Air Injection System Insufficient Flow Bank 1
- P0492 Secondary Air Injection System Insufficient Flow Bank 2
- P0493 Fan Overspeed
- P0494 Fan Speed Low
- P0495 Fan Speed High