As of my last update in September 2021, BMW vehicles utilize a set of diagnostic trouble codes (DTCs) to indicate potential issues with various systems in the car. Similar to the previous response, please note that the list below might not be exhaustive, and the specific codes can vary based on the BMW model, year, and the diagnostic system used. Here are some common BMW diagnostic trouble codes:
1. P0171 - System Too Lean (Bank 1)
2. P0174 - System Too Lean (Bank 2)
3. P0300 - Random/Multiple Cylinder Misfire Detected
4. P0301 - Cylinder 1 Misfire Detected
5. P0302 - Cylinder 2 Misfire Detected
6. P0303 - Cylinder 3 Misfire Detected
7. P0304 - Cylinder 4 Misfire Detected
8. P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
9. P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
10. P0442 - Evaporative Emission System Leak Detected (Small Leak)
11. P0455 - Evaporative Emission System Leak Detected (Gross Leak)
12. P0491 - Secondary Air Injection System Insufficient Flow (Bank 1)
13. P0492 - Secondary Air Injection System Insufficient Flow (Bank 2)
14. P0500 - Vehicle Speed Sensor Malfunction
15. P0600 - Serial Communication Link Malfunction
16. P1128 - Long Term Fuel Trim B1 System Too Lean
17. P1129 - Long Term Fuel Trim B1 System Too Rich
18. P1130 - Oxygen Sensor B1 S1 Circuit Range/Performance
19. P1138 - Oxygen Sensor B1 S2 Circuit Range/Performance
20. P1168 - Fuel Rail Sensor In-Range High
21. P1188 - Fuel Control (Bank 1 Sensor 1) System Too Rich
22. P1189 - Fuel Control (Bank 2 Sensor 1) System Too Rich
23. P1250 - Fuel Level Too Low
24. P1340 - Misfire During Start Cylinder 4
25. P1351 - Misfire Cylinder 5 With Fuel Cut-Off
26. P1447 - Purge Control Valve Control Circuit Low
27. P1449 - Leak Diagnostic Pump Control Circuit Signal Low
28. P1554 - Idle Speed Control Valve Opening Coil Control Circuit Signal High
29. P1620 - MAP Cooling Control Circuit Signal High
30. P1632 - Throttle Valve Adaptation; Spring Test Failed
If you encounter any of these diagnostic codes on your BMW, it's best to have a qualified mechanic or BMW specialist diagnose and address the specific issue. Modern BMW vehicles have sophisticated diagnostic systems, so professional equipment is often necessary for accurate readings and repairs.
