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OpenHaldex Overview

OpenHaldex-S3

A Free Plug-In Haldex Controller for VW and Audi.

OpenHaldex Web UI Screenshot - Live Haldex Controller Interface

Unlimited customization to your front and rear wheel bias.

Build it in minutes. Install it in under 10.

OpenHaldex is a free, open-source AWD controller for Gen 1, 2, and 4 Haldex-equipped Volkswagen and Audi vehicles.

If you can wire a light switch, you can build this in minutes.

Lift the rear seat, plug it inline, and you're done.

No custom wiring harness. No soldering or coding. No permanent modifications.

What it does:

  • Direct control over Haldex AWD behavior.
  • Speed, throttle, RPM, or map-based locking.
  • Live diagnostics and fully decoded CAN logging.
  • Web based control panel and online updates over hotspot.
Build OpenHaldex-S3 for Less Than $50.

Frequently Asked Questions

What is this? OpenHaldex is a free, open-source AWD controller for Gen 1, 2, and 4 Haldex-equipped Volkswagen and Audi vehicles.

Will this damage my Haldex or drivetrain? OpenHaldex is a tool and should be used carefully, it is configured with safe default settings. If you are unsure how to configure them, then you shouldn't. Default settings are still much more control and performance than OEM.

Will this set a fault lamp? No. If you are using it normally, it will not. If you are configuring more aggressive settings, it's recommended to disable Haldex broadcast while they're enabled. This light will go away next time you start the car.

Compatible Vehicles List

Gen 1 Haldex

  • Audi A3 S3 8L Quattro 1998-2003
  • Audi TT 8N Quattro 1998-2006
  • VW Bora 2.8 V6 4motion 1998-2004
  • VW Golf 1J Mk4 R32 4Motion 1998-2004
  • VW Sharan 7M Phase 1 Mk1 1998-2007
  • VW New Beetle RSi 1998-2003
  • Skoda Octavia 1U 4x4 Mk1 1998-2004
  • Seat Leon 1M Mk1 Cupra4 1998-2005
  • Seat Alhambra 7M 1998-2007

Gen 2 Haldex

  • Audi A3 S3 8P Quattro pre 2009 facelift 2004-2008
  • Audi TT/TTS 8J Quattro pre facelift 2007-2009
  • Volkswagen Golf 1K Mk5, R32, 4Motion 2004-2008
  • Volkswagen Passat 3c, 4Motion, Santana, CC 2005-2009
  • Volkswagen Transporter T5 Prefacelift 2003-2009
  • Seat Altea 2007-2010
  • Seat Alhambra 7M 2005 Facelift 2005-2010
  • Skoda Octavia 1Z pre 2009 facelift 2004-2009

Gen 4 Haldex

  • VW Golf Mk6 5K 4Motion 2008-2012
  • VW Golf R Mk6 5K 2008-2012
  • VW Tiguan B6 2008-2014
  • VW Sharan 7N Mk2 2011-2015
  • VW Passat, CC, B7 2010-2015
  • VW Transporter Late Model T5 Facelift 2009-2015
  • VW Caddy Mk3 2K 2010 Facelift 2010-2015
  • Audi A3 S3 8P Facelift 2009-2012
  • Audi TT / TTS / TTRS, 8J, 2008 Facelift 2008-2012
  • Audi Q3 / RS Q3 2011-2013
  • Seat Altea XL, Freetrack 2010-2015
  • Seat Alhambra 2nd Generation 7N 2011-2013
  • Skoda Yeti Pre 2014 Facelift 2009-2014
  • Skoda Superb B6 Type 3T 2008-2014
  • Skoda Octavia 4x4, Scout, vRS 4x4 1Z Facelift 2009-2014
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