My apologies, it seems there was an oversight in my previous responses. Here are some common Audi diagnostic trouble codes (DTCs) that you may come across:
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. P1136 - Long Term Fuel Trim B1 System Too Lean
15. P1138 - Long Term Fuel Trim B1 System Too Rich
16. P113A - Long Term Fuel Trim B2 System Too Lean
17. P113C - Long Term Fuel Trim B2 System Too Rich
18. P1140 - Mass or Volume Air Flow Circuit Range/Performance Problem
19. P1296 - Throttle Valve Control Part-Throttle Stop Position Performance
20. P1479 - Brake Boost Vacuum System Mechanical Failure
21. P1503 - Load Signal From Generator Range/Performance
22. P1557 - Charge Pressure Control Positive Deviation
23. P1558 - Charge Pressure Control Deviation
24. P1592 - Diagnostic Module for Tank Leakage (DM-TL) Solenoid Valve Output Stage Electrical malfunction
25. P1624 - Engine Control Module (ECM) Incorrect Coding
26. P1649 - Diagnostic Module Tank Leakage (DM-TL) Pump Too High During Switching
27. P1857 - Brake Boost Vacuum Pump Mechanical Malfunction
28. P2177 - System Too Lean Off Idle (Bank 1)
29. P2279 - Intake Air System Leak
30. P2293 - Fuel Pressure Regulator 2 Performance
Please note that the specific codes can vary based on the Audi model, year, and the diagnostic system used. If you encounter any of these diagnostic codes on your Audi vehicle, it is recommended to have a qualified mechanic or Audi dealership diagnose and address the specific issue. Using professional diagnostic equipment ensures accurate readings and appropriate repairs.
