Audi A4 B9 (2016–present) is built on a highly modular electronic architecture, allowing owners to unlock numerous "hidden" factory features or customize existing ones through software modifications. This process is commonly performed using diagnostic tools such as (Vag-Com Diagnostic System) or the more user-friendly Popular Coding Modifications
The following table summarizes the most frequent coding changes requested by the Audi community:
Coding the Audi A4 B9 involves using diagnostic tools like VCDS (VAG-COM) or OBDeleven to access control modules and modify "bits" to unlock hidden features. Essential Pre-Coding Safety
Perform an Auto-Scan: Always run a full diagnostic scan and save the results before making any changes. This provides a backup of your original coding.
Maintain Battery Voltage: Ensure your car is connected to a battery charger or has a strong charge; low voltage during coding can cause modules to fail.
Never Copy-Paste: Avoid copying coding strings from different vehicles directly into your modules; hardware versions may differ.
Introduction
The Audi A4 B9 (2015-2019) is a popular luxury sedan that offers a range of features and technologies. One of the key aspects of owning an A4 B9 is the ability to customize and code the vehicle's systems using VAG (Volkswagen Audi Group) tools. In this review, we'll take a look at the various coding options available for the A4 B9 and provide a comprehensive list of codes.
What is Coding?
For those new to VAG coding, it's essential to understand what coding entails. Coding refers to the process of modifying the vehicle's software to enable or disable features, change settings, or unlock hidden functions. This is done using specialized tools, such as VCDS (VAG-COM Diagnostic System) or OBD11.
Why Code Your A4 B9?
Coding your A4 B9 can enhance your driving experience, provide additional functionality, and even improve safety. Some popular reasons for coding include:
A4 B9 Coding List
Here's a non-exhaustive list of coding options for the A4 B9:
Convenience
Lights & Vision
Infotainment
Safety & Driver Assistance
Performance
Other
Conclusion
The Audi A4 B9 offers a wide range of coding options to enhance your driving experience. While this list is not exhaustive, it provides a solid starting point for exploring the possibilities. Before attempting any coding, ensure you have the necessary tools and knowledge to avoid potential issues. Always follow proper safety procedures and consult with a professional if unsure.
Recommendations
Future Updates
As new coding options and techniques become available, this list will be updated. Stay tuned for future revisions and expansions on this review.
The Audi A4 B9 (2016+) is a popular platform for "coding" or "tweaks," which involves using diagnostic tools like VCDS (Ross-Tech)
to unlock hidden software features or modify existing behaviors. Essential Tools for Coding VCDS (Ross-Tech):
A professional-grade tool requiring a laptop and a specialized cable. It is widely considered the standard for in-depth "long coding". OBDeleven:
A Bluetooth-based mobile tool that uses an app on your smartphone. It is popular for its "One-Click Apps"
which perform complex coding automatically for a small credit fee. Safety Tip:
Always perform a full scan and backup of your original settings before making changes. Use a battery maintainer if coding for extended periods to prevent voltage drops. Top Popular Tweaks for Audi A4 B9
Audi A4 B9 (2016–2024) features a wide range of "hidden" coding options that can be unlocked using tools like VCDS (Ross-Tech) or OBDeleven. These modifications allow you to customize your instrument cluster, lighting behavior, and convenience settings. Essential Instrument Cluster Tweaks
Needle Sweep (Staging): Gauges sweep their full range when the ignition is turned on. audi a4 b9 coding list
VCDS: Module 17 (Instruments) > Coding > Long Coding Helper > Byte 1 > Enable Bit 0 (Check "Staging" or "Gauge Test/Needle Sweep active").
Lap Timer: Adds a lap timer to the Driver Information System (DIS) or Virtual Cockpit.
VCDS: Module 17 (Instruments) > Coding > Long Coding Helper > Byte 1 > Enable Bit 3.
Virtual Cockpit Sport Layout: Can sometimes be enabled on non-RS models to show the central tachometer.
VCDS: Module 17 > Byte 2 > Bits 3-7 (Requires choosing the specific vehicle variant, e.g., RS4 for A4). Lighting & Convenience Customization
Scandinavian DRLs: Keeps the rear taillights on whenever the front Daytime Running Lights (DRLs) are active.
Comfort Window/Sunroof Control: Allows you to open or close windows and tilt the sunroof using the remote key fob.
VCDS: Module 46 (Cent. Conv.) > Coding > Long Coding Helper > Check "Comfort Operation: Remote Control active".
Reverse Mirror Tilt: Tilts the passenger-side mirror downward when in reverse to help with curb parking (often requires the mirror switch to be set to the passenger side).
Soundaktuator Volume: Reduce or disable the synthetic engine noise pumped into the cabin.
High Beam with Fog Lights: Allows front fog lights to remain on even when high beams are activated. Infotainment & System Features
Unlocking the full potential of your Audi A4 B9 (2016–Present) goes beyond performance tunes and physical mods. With the right tools, you can access dozens of "hidden" factory features through software coding.
This comprehensive coding list covers the most popular modifications using common diagnostic tools like VCDS (VAG-COM) or OBDeleven. Essential Tools for B9 Coding
Before diving in, you need a way to communicate with your car’s control modules:
VCDS (Ross-Tech): The enthusiast standard, requiring a specialized VCDS cable and a laptop.
OBDeleven: A more mobile-friendly option that uses a Bluetooth dongle and a smartphone app. It offers "One-Click Apps" for easy changes using credits. Visual & Dashboard Customizations Audi A4 B9 (2016–present) is built on a
These tweaks change what you see on your Virtual Cockpit or standard instrument cluster. Control Module Coding / Adaptation Detail Needle Sweep (Staging) 17-Instruments Coding -> Byte 1, Bit 0 (Active) Lap Timer / Oil Temp 17-Instruments Coding -> Byte 1, Bit 3 (Active) Show Gear Number (D1/S1) 02-Transmission Adaptation -> Single gear display -> "D on/S on" S4 Startup Screen 17-Instruments Coding -> Byte 2, Bit 3 (Active) Acceleration Display 17-Instruments Check options in Long Coding for specific cluster versions Lighting & Visibility Mods Customize how your DRLs and exterior lights behave.
DRL Menu in MMI: Allows you to turn off Daytime Running Lights via the screen.
Module 09 (Central Electrics) -> Long Coding -> "DRL MMI" set to Active.
Scandinavian DRLs: Keeps your taillights on even when only DRLs are active.
Cornering Lights via Fog Lights: Fog lights illuminate when you turn the steering wheel at low speeds.
Disable Amber Side Markers (US Spec): Turns off the orange lights in the headlight housing.
Module 09 -> Long Coding -> "Sidemarker_via_lcm" -> Not_Active. Hidden Features - Audi A4 B9 (2016 and later)
| Feature | Adaptation | New Value |
|--------|-------------|------------|
| Coming Home / Leaving Home via rain sensor | Außenlicht_Coming_Home → HMI → Regen_Licht_Sensor | Active |
| Rear daytime running lights (DRL) together with front DRL | Daytime running lights → Tagfahrlicht-Dauerfahrlicht aktiviert zusaetzlich Standlicht | Active |
| Scandinavian DRL (rear lights + front DRL) | Daytime running lights → Standlicht aktiviert zusaetzlich Tagfahrlicht | Active |
| Flash turn signal 5 times (instead of 3) | Komfortblinken Blinkzyklen | 5 |
| Dim LED headlights as DRL | Dimmunt Stg. DRL | 26 (adjust as desired) |
If you are using VCDS, you won't see plain English names like "Needle Sweep." You will see Long Coding Helper bytes.
Even with the right list, things go wrong. Here’s how to fix it.
Before diving into the codes, understand the architecture. The B9 uses UDS (Unified Diagnostic Services) protocols. Unlike older VAG cars, you cannot simply change a byte; you often need to adapt channels or change binary bits.
Required Tools:
Critical Notes:
The Audi A4 B9 (2015–2020, including the 2021 facelift in some markets) is a technological masterpiece. However, Audi, like many manufacturers, ships vehicles with a treasure trove of features disabled by default. Whether due to regional regulations, marketing segmentation, or simply to push you toward a higher trim level, these hidden functions are waiting to be activated.
To unlock them, you need diagnostic software like VCDS (VAG-COM) , OBD11, or VCP. This extensive guide provides a verified coding list for the B9 platform. Warning: Always back up your original control module maps before making changes.