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This guide provides instructions on how to read diagnostic trouble codes (DTC), also known as fault codes, from various modules on an Audi. 

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When a warning light pops up on your Audi, you can use an OBD-II scanner to read the codes. A good Audi All System Scanner will diagnose systems such as Engine, ABS, Airbag, TPMS  Transmission, Traction Control, or any other module.

A generic OBD-II scanner will only be able to read codes from the engine control module.

On the other hand, a Professional Diagnostic Scanner will be able to read all systems, clear codes, test sensors, and even perform adaptations. 

In this guide, we will examine how you can read and remove Audi fault codes using various OBD-II scanners.

How to Read Audi fault codes

  1. Park your Audi on a level surface and set the parking brakes.How to read Audi fault codes
  2. Open the driver's door and locate the diagnostic port under the dashboard. 

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  3. Plug your scanner into the OBD2 port Plug scanner into Audi port for diy troubleshooting
  4. Turn on the ignition by turning the key to position II. If your Audi has START/STOP feature, press the button without pressing the brake pedal. Turn ON Audi ignition to read and clear codes with a scanner
  5. Allow your scanner to turn on. Follow the promptings on your scanner to read fault codes.
  6. Read check engine light from the ECU by going to the OBD-II menu, then Read Codes. Watch this video to learn how to use an OBD 2 scanner to read and clear Audi Check Engine Light codes.

Diagnose Audi Anti-lock Brake System

Watch this video to learn how to use ABS OBD-II Scanner to retrieve Audi Anti-lock Brake System codes.

  1. Plug scanner into OBD-II port. 
  2. Turn on ignition.
  3. Turn on the scanner.
  4. Select the Audi model.
  5. Select-control unit ABS.
  6. Select Read Codes

Diagnose Audi Airbag Warning Light


Watch this video to learn how to use an Audi Airbag Scanner to troubleshoot your Audi airbag light. 

  1. Plug in scanner into the OBD-II port.
  2. Turn on ignition.
  3. Turn on the scanner.
  4. Select your Audi model from the menu.
  5. Select SRS/Airbag control unit.
  6. Select Read Fault Codes from the menu.

Knowing which scanner to use to read Audi fault codes may be the most difficult part. Level 1 OBD2 scanners can only be used to retrieve fault codes from your Audi Engine Control Unit (ECU). Those are faults that trigger the Check Engine warning light on the dashboard.

To diagnose ABS and Airbag/SRS warning lights, you will need an OBD-II scanner to read the Audi manufacturer's fault codes. The procedure for reading Audi fault codes is similar, regardless of which scanner you are using.