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How to read Audi fault codes

Last Updated on Wednesday Mar 21, 2018

If the warning light such as Check Engine, ABS, Airbag, TPMS are coming ON in your Audi, a Diagnostic Trouble Code (DTC) gets stored in one or more control unit. The first step in troubleshooting the problem is retrieving the fault code. In this guide, we will take a look at how you can read and clear Audi fault codes using various OBD-II scanners.

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 a Level 2 OBD-2 scanner. If you don't have an Audi scanner, take a minute to read the article on Best Audi/VW OBD-II scanner. The procedure for reading Audi fault codes is similar regardless of which scanner you are using.

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1. What you will need 

Audi OBD-II/CAN Scanner

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2. How to read Audi fault codes

Step 1

How to read Audi fault codes

Park your Audi on a level surface and set the parking brakes.

Step 2

Open the driver's door and locate the OBD-2 port.

Step 3

Plug scanner into Audi port for diy troubleshooting

Plug your scanner into the OBD2 port

Step 4

Turn ON Audi ignition to read and clear codes with a scanner

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.

Step 5

Allow your scanner to turn on. Follow the promptings on your scanner to read fault codes.

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3. Diagnose Audi Check Engine Light

Watch this video to learn how to use a Level 1 OBD 2 scanner to read and clear Audi Check Engine Light codes.

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4. Diagnose Audi Anti-lock Brake System

Watch this video to learn how to use a Level 2 OBD 2 scanner to retrieve Audi Anti-lock Brake System codes.

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5. Diagnose Audi Airbag Warning Light

Watch this video to learn how to use a Level 2 OBD-II scanner to troubleshoot Audi Airbag Light on.

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  1. If your scanner cannot communicate with the ECU ensure your scanner is compatible with your year, make and model. Also check that the 16 pin connector is fully inserted into the OBD-II port. 
  2. Basic code readers typically can only diagnose check engine light. To diagnose ABS, Airbag and Transmission problems a more advanced scanner is needed.