P0400-P0499
- P041E Exhaust Gas Recirculation Temperature Sensor “B” Circuit Intermittent/Erratic
- P041F Secondary Air Injection System Switching Valve “A” Circuit Low
- P0420 Catalyst System Efficiency Below Threshold (Bank 1)
- P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
- P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
- P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
- P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
- P0425 Catalyst Temperature Sensor (Bank 1, Sensor 1)
- P0426 Catalyst Temperature Sensor Range/Performance (Bank 1, Sensor 1)
- P0427 Catalyst Temperature Sensor Low (Bank 1, Sensor 1)