As of my last update in September 2021, Alfa Romeo vehicles also use a set of diagnostic trouble codes (DTCs) to identify potential issues with various systems in the car. Alfa Romeo, being an Italian luxury car manufacturer, typically uses sophisticated diagnostic systems. The specific codes can vary based on the Alfa Romeo model, year, and the type of diagnostic system used. Here are some common Alfa Romeo 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 - Swirl Control Valve Control Solenoid Valve
16. P1131 - Swirl Control Valve Position Sensor Bank 1
17. P1140 - Camshaft Position Sensor (CMP) Signal Low
18. P1141 - Camshaft Position Sensor (CMP) Signal Out of Range
19. P1143 - Air/Fuel Ratio (A/F) Sensor Range/Performance Problem (Bank 1 Sensor 1)
20. P1150 - Air/Fuel Ratio (A/F) Sensor Circuit Range/Performance Malfunction (Bank 2 Sensor 1)
21. P1153 - Air/Fuel Ratio (A/F) Sensor Circuit Response Malfunction (Bank 2 Sensor 1)
22. P1200 - Fuel Pump Relay Circuit Problem
23. P1421 - Secondary Air Injection System, Bank 1 Flow Too Low
24. P1423 - Secondary Air Injection System, Bank 1 Insufficient Flow
25. P1424 - Secondary Air Injection System, Bank 2 Insufficient Flow
26. P1516 - Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
27. P1521 - Incorrect Engine Oil Type
28. P1606 - Rough Road Sensor Circuit Malfunction
29. P1632 - Throttle Valve Adaptation; Spring Test Failed
30. P1792 - Throttle Actuation Potentiometer Range/Performance
