What is Adaptations and Coding?
Car Coding is a relatively new thing in the Automotive World, and it implies software modifications to a Vehicle to allow the use of functions not available in the Car when it left the factory for different reasons, mainly local regulations (Some countries have different requirements from when the car leaving the factory). Coding does not imply changing the software! It only changes pre-programmed options already existing in the software. In modern Vehicles, there are functions that the manufacturer has not activated. Changing these settings is called Coding.
What can Car Coding bring to my Vehicle?
As we explained above, most cars have country-specific settings for their features, most vehicles have limitations and other restrictions. With the help of coding, the owner can change the chimes on their car for when they lock and unlock, set how many times its one-touch signal flickers for the indicator, remember settings for Start/Stop systems, and more. Coders can also activate cornering headlights with fog lights, deactivate some buzzing sounds, and enable multiple functions of the comfort module.
Other possibilities involve lowering the level of the passenger-side mirror when reversing, activate the “needle sweep” function when the ignition is on (only for some Volkswagen AG models), automatic door locking at a particular speed, U.S.-style daytime running lights, the auto-hold function for vehicles with electrically operated parking brake, and others.
Do we travel?
Yes. Let us know what you need doing and we will price up a quote to come out to you
What if I have Warranty? Will coding void my Warranty?
This is a question always asked which is a Yes & No.
Yes depending on dealership as they always try to wriggle out of any warranty claim.
No as we offer a free service to take off any coding before your vehicle goes in for service/warranty work and reapply free of charge after.
How long does coding take?
Generally around 45 minutes depending on what you require! We never like to rush and we will go at the customer's pace. We will always allow the customer to test and play around with any feature we have activated. We will explain the process and ensure you are fully confident in the work we have carried out.
What is SERMI?
SERMI (Secure Repair and Maintenance Information) is a European-wide certification scheme that controls access to security-related vehicle data such as immobiliser codes, key programming, and anti-theft systems. Only vetted, approved businesses can legally access this information.
Is 125 Coding SERMI approved?
Yes. 125 Coding achieved official SERMI approval on 1st May 2026, alongside our existing credentials as an Authorised VW Group UK Independent Repairer and Porsche Partner Network member.
Why does SERMI approval matter to me as a customer?
SERMI approval means your vehicle is being worked on by a vetted, background-checked professional with legitimate access to manufacturer security data. This protects your vehicle from improper coding, ensures insurance compliance, and gives you peace of mind that the job is done correctly and securely.
What types of work require a SERMI approved repairer?
Any work that touches vehicle security systems — including key programming and replacement, immobiliser repairs, ECU coding involving security modules, and anti-theft system work. As regulations tighten across the UK and Europe, more services are falling under SERMI requirements.
How is SERMI approval different from other certifications?
While certifications like VW Group Authorised Independent Repairer or Porsche Partner Network cover technical competence and manufacturer access, SERMI specifically governs security data access. It involves criminal record checks, identity verification, and ongoing audits — making it one of the strictest certifications in the industry.
Where is 125 Coding based?
We're based in Dewsbury, West Yorkshire, and serve customers across Yorkshire and the wider North of England.