The Audi A4 B9’s start-stop system, designed to save fuel in city driving, can be a nuisance for some drivers. If you’d prefer to take control of when your engine stops and starts, you can disable the start-stop system using a diagnostic tool like VCDS. This guide will walk you through the process.

Understanding Audi A4 B9 Start-Stop and VCDS

Before we dive into the how-to, let’s clarify what we’re dealing with:

• Audi A4 B9 Start-Stop System: This system automatically shuts off your engine when the car is at a standstill (like at a red light) and restarts it when you release the brake pedal. While good for fuel efficiency, some find the constant on-off jarring.

• VCDS (Vag-Com Diagnostic System): This software, paired with a compatible cable, allows you to access and modify your Audi’s control modules, including the one governing the start-stop function.

Audi A4 B9 Start Stop Button

Disabling Audi A4 B9 Start Stop with VCDS: A Step-by-Step Guide

Here’s how to disable your Audi A4 B9’s start-stop system using VCDS:

1. Gather Your Tools:

   • A laptop with VCDS software installed.
   • A VCDS compatible cable to connect your laptop to your car’s OBD-II port.

2. Connect and Prepare:

   • Connect the VCDS cable to your laptop and the OBD-II port (usually located under the dashboard on the driver’s side).
   • Turn your Audi’s ignition on, but do not start the engine.

3. Launch VCDS and Select Control Module:

   • Open the VCDS software on your laptop.
   • Select “Select Control Module.”
   • Choose “19 – CAN Gateway.”
   • Click on “Coding – 06.”

4. Modify the Coding:

   • Look for the “Byte 00” section.
   • Within “Byte 00,” locate the bit responsible for the start-stop system. The exact bit can vary, so refer to your VCDS documentation or online forums for your specific model year.
   • Uncheck the box for the start-stop bit to disable it.

5. Save and Exit:

   • Click “Do It” to save the coding changes.
   • Exit VCDS and disconnect the cable from your car.

Important Notes and Considerations

• Battery Impact: While disabling the start-stop system won’t harm your car, it might slightly reduce your fuel efficiency.
• Software Updates: A software update from Audi could potentially re-enable the start-stop function. You might need to repeat this process after updates.
• Legal Requirements: Be aware of local regulations regarding vehicle emissions. Some areas may require the start-stop system to be functional.

Seeking Professional Assistance

If you’re not comfortable working with diagnostic software or are unsure about any step, it’s best to consult a qualified Audi technician or a reputable automotive electronics specialist. They can safely and correctly disable the start-stop system for you.

Still Have Questions About Disabling Audi A4 B9 Start Stop with VCDS?

We’re here to help! You can reach us at:

• Phone: +1 (641) 206-8880 and our email address: vcdstool@gmail.com
• Office: 6719 W 70th Ave, Arvada, CO 80003, USA

We’re experts in automotive electronics and can provide the guidance and support you need to understand your options for start stop audi vcds. Don’t hesitate to contact us.