Audi Car Errors: Error Codes and Their Descriptions.

Common Audi Error Codes

1. P0300 - Random/Multiple Cylinder Misfire Detected

This code indicates that the engine is experiencing random misfires. Possible causes include faulty spark plugs, ignition coils, fuel injectors, or issues with the fuel supply system.

1. P0171 - System Too Lean (Bank 1)

This code suggests that the engine's air-fuel mixture is too lean. Potential causes include vacuum leaks, a malfunctioning mass airflow sensor (MAF), or problems with the fuel system.

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

This code indicates that the catalytic converter is not operating as efficiently as it should. This could be due to a failing catalytic converter, oxygen sensor issues, or exhaust leaks.

1. P0113 - Intake Air Temperature Sensor 1 Circuit High Input

This code means that the intake air temperature sensor is reporting a higher than expected temperature. Causes can include a faulty sensor, wiring issues, or a bad connection.

1. P0442 - Evaporative Emission Control System Leak Detected (small leak)

This code signals a small leak in the EVAP system, which captures fuel vapors. Possible causes include a loose gas cap, damaged hoses, or a faulty EVAP canister.

Audi-Specific Errors

1. U0100 - Lost Communication with ECM/PCM "A"

This code indicates that communication with the Engine Control Module (ECM) or Powertrain Control Module (PCM) has been lost. Possible causes include a faulty module, wiring issues, or a software problem.

1. C1234 - Left Rear Wheel Speed Sensor Circuit

This code points to an issue with the left rear wheel speed sensor circuit. Causes can include a faulty wheel speed sensor, wiring problems, or a malfunctioning control module.

1. B1000 - Airbag Control Module Failure

This code indicates a failure in the airbag control module. Potential causes include a faulty airbag module, sensor issues, or wiring problems.

1. P0299 - Turbocharger/Supercharger "A" Underboost Condition

This code suggests that the turbocharger or supercharger is not producing enough boost. Causes can include a faulty boost pressure sensor, issues with the turbocharger, or vacuum leaks.