Below is a detailed list of common Audi Diagnostic Trouble Codes (DTCs). Audi vehicles are equipped with advanced onboard diagnostic systems, and these codes provide insights into various issues in their complex systems.
| Code | Description |
|---|---|
| P0101 | Mass Airflow (MAF) Circuit Range/Performance |
| P0106 | Manifold Absolute Pressure (MAP) Sensor Circuit Range/Performance |
| P0113 | Intake Air Temperature (IAT) Sensor Circuit High Input |
| P0128 | Coolant Thermostat Temperature Below Regulating Temperature |
| P0171 | System Too Lean (Bank 1) |
| P0172 | System Too Rich (Bank 1) |
| P0300 | Random/Multiple Cylinder Misfire Detected |
| P0301 | Cylinder 1 Misfire Detected |
| P0340 | Camshaft Position Sensor Circuit Malfunction |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0441 | Evaporative Emission Control System Incorrect Purge Flow |
| P0455 | Evaporative Emission System Leak Detected (Large Leak) |
| P0500 | Vehicle Speed Sensor Malfunction |
| P0562 | System Voltage Low |
| P0700 | Transmission Control System Malfunction |
| P0741 | Torque Converter Clutch Circuit Performance or Stuck Off |
| P1128 | Long Term Fuel Trim Too Lean |
| P1296 | Engine Cooling System Malfunction |
| P2181 | Cooling System Performance |
| P2263 | Turbocharger/Supercharger Boost System Performance |
| U0100 | Lost Communication With ECM/PCM |
| U0121 | Lost Communication With Anti-lock Brake System (ABS) Control Module |
| U1000 | Generic Communication Error |
| B2000 | Control Module Fault |
| B201A | Coding Error |
| C1201 | Engine Control System Communication Circuit Malfunction |
| C1401 | Brake Pressure Sensor Signal Fault |
| C1555 | Steering Angle Sensor Fault |
Key Systems Covered:
- Powertrain DTCs: Engine and transmission-related issues.
- Emissions and Fuel System DTCs: Compliance and fuel system efficiency.
- Electrical and Communication DTCs: Module and sensor faults.
- Turbocharger and Cooling System DTCs: Issues specific to Audi’s performance systems.
- Chassis and Brake System DTCs: ABS and steering-related problems.
