This is a personalized upgrade chip for your early 90 hp TDI cars with socketed engine computer and the 1Z and AHU motors. Each chip is tailored to your individual car's mods and desired smoke and driving characteristics.

These cars include:


  • 1997 - 1998 Mk3 Jetta TDI with AHU Engine Code
  • 1996 - 1997 B4 Passat TDI with AHU or 1Z Engine Code
  • Also fits 1999 Jettas on the Mk3 Platform with AHU Engine Code (fairly uncommon and mostly found in Canada) If you are unsure, give us a ring 877-537-6283


This is an easy do-it-yourself install that can be done with common hand tools following instructions we will provide with your chips.Each tuning file is unique and written for your engine by kerma's tuning department.. We will follow up your order with an email and tuning form which will guide us in personalizing your customized tune ( ex modifications (mods) to the vehicle, your preferred driving characteristics, and acceptable smoke level)

If you need help finding the ECU number or have any other questions, we can be reached by following the "contact us" link shown above.We offer several options for delivery.

Please contact us by phone or e-mail do discuss your preference.

We can determine if your ECU is already socketed.Some European ECU versions are not socketed from the factory, which may require sending us your engine computer for socketing. ($75 fee) Chip installation requires opening the ECU to physically access the chip, and we have a good DIY guide on removing your ECU and swapping chips, this makes the job super easy!

VW TDI ECU tuning Mk3/B4 96-98 Jetta and Passat

SKU: AHUtune1

    Tel: 919.366.6312


    Monday:           10 AM - 6 PM

    Tuesday:          9 AM - 6 PM

    Wednesday:   9 AM - 6 PM

    Thursday:        9 AM - 6 PM

    Friday:               9 AM - 3 PM

    Saturday:         9 AM - 1 PM

    Sunday:             9 AM - 1 PM

    We don't just
    sell and service
    European vehicles; 
    we own,
    live and
    & BMW!
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    - European performance specialty- Volkswagen, Audi, BMW and other imports

    - Oil change & Fluid flushes

    - Brakes & Rotors

    - Steering & Suspension

    - Wheels and Tires

    - Diagnostics

    - Engine & Transmission Tunes

    - Vag-com Coding

    - Engine Internals

    - Car Audio

    - Pre-purchase Inspections

    - Window Tinting

    - Lighting & Bulb Replacement

    - Full detail & Autobody

    - Exhaust Systems & Mufflers

    - Car Wraps

    - Battery, Starter & Alternators


    7400 Siemens Dr

    Wendell, NC 27591

    Nosotros hablamos español.