1. P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
2. P0171 - System Too Lean (Bank 1)
3. P0030 - HO2S Heater Control Circuit (Bank 1 Sensor 1)
4. P0031 - HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
5. P0133 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)