Bentley vehicles also use a set of diagnostic trouble codes (DTCs) to identify potential issues with various systems in the car.

As of my last update in September 2021, Bentley vehicles also use a set of diagnostic trouble codes (DTCs) to identify potential issues with various systems in the car. Bentley, being a luxury car manufacturer, typically uses sophisticated diagnostic systems. The specific codes can vary based on the Bentley model, year, and the type of diagnostic system used. Here are some common Bentley diagnostic trouble codes:

1. P0101 - Mass or Volume Air Flow Circuit Range/Performance Problem

2. P0171 - System Too Lean (Bank 1)

3. P0172 - System Too Rich (Bank 1)

4. P0300 - Random/Multiple Cylinder Misfire Detected

5. P0301 - Cylinder 1 Misfire Detected

6. P0302 - Cylinder 2 Misfire Detected

7. P0303 - Cylinder 3 Misfire Detected

8. P0304 - Cylinder 4 Misfire Detected

9. P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

10. P0430 - Catalyst System Efficiency Below Threshold (Bank 2)

11. P0442 - Evaporative Emission System Leak Detected (Small Leak)

12. P0455 - Evaporative Emission System Leak Detected (Gross Leak)

13. P0507 - Idle Control System RPM Higher Than Expected

14. P1000 - OBD-II Monitor Testing Incomplete

15. P1130 - Air/Fuel Ratio (A/F) Sensor Circuit Range/Performance Malfunction

16. P1135 - Air/Fuel Ratio (A/F) Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

17. P1150 - Air/Fuel Ratio (A/F) Sensor Circuit Range/Performance Malfunction (Bank 2 Sensor 1)

18. P1153 - Air/Fuel Ratio (A/F) Sensor Circuit Response Malfunction (Bank 2 Sensor 1)

19. P1200 - Fuel Pump Relay Circuit Problem

20. P1423 - Secondary Air Injection System, Bank 1 Insufficient Flow

21. P1424 - Secondary Air Injection System, Bank 2 Insufficient Flow

22. P1516 - Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

23. P1570 - Throttle Valve Adaptation Not Started

24. P1606 - Rough Road Sensor Circuit Malfunction

25. P1611 - MIL Request Circuit Voltage Low

26. P1620 - Engine Control Module (ECM) Incorrect Coding

27. P1632 - Throttle Valve Adaptation; Spring Test Failed

28. P1633 - Keep Alive Power Voltage Too Low

29. P1634 - Data Bus Powertrain Missing Message from Airbag Controller

30. P1792 - Throttle Actuation Potentiometer Range/Performance

Please note that Bentley vehicles' diagnostic systems are complex, and in-depth knowledge and specialized tools are often required for accurate diagnosis and repair. If you encounter any of these diagnostic codes on your Bentley vehicle, it is recommended to have a qualified mechanic or Bentley dealership diagnose and address the specific issue.