What is a Mileage Blocker?

What is a Mileage Blocker? – Usage, Installation & Legal Considerations

What is a Mileage Blocker?

A mileage blocker is an electronic module that can be fitted to a vehicle to stop mileage from being recorded on the dashboard and control units while driving. These devices are typically used for testing, diagnostic, and off-road purposes, allowing owners to run their cars without adding unnecessary mileage during specific conditions.

At our Slough-based workshop, we supply and install mileage blockers for a wide range of vehicles, including BMW, Mercedes, Audi, Porsche, Range Rover, and other high-end cars. Installation is professional and discreet, with plug-and-play solutions available for most models.

Important Notice: Mileage blockers are sold strictly for off-road, testing, and motorsport use only. We give no guarantees regarding whether the device is detectable, and we do not guarantee that usage will remain hidden from dealer systems, diagnostic tools, or future inspections. Customers are solely responsible for how the product is used.

Why Choose Onyx Performance?

As Seen on Carwow

We’ve been proudly featured on Carwow – a testament to the quality, professionalism, and performance-focused results that set us apart. Watch our feature here to see us in action.

Expertise You Can Trust

With years of experience and deep technical knowledge, our team understands performance vehicles inside and out – from custom remaps to high-end servicing.

Advanced Workshop & Tools

We operate from a state-of-the-art facility in Slough, equipped with cutting-edge diagnostics, dyno testing, and industry-leading tools for accurate, high-quality work.

Tailored Solutions for Every Vehicle

We don’t believe in one-size-fits-all. Every car gets a bespoke approach, ensuring the best results whether it’s a remap, upgrade, or routine service.

Trusted Nationwide

Performance enthusiasts from across the UK come to Onyx because they know they’ll receive premium-quality workmanship, careful attention to detail, and honest advice.

Complete Care, All in One Place

From tuning and servicing to tyres, trackers, and immobilisers – we offer a full suite of services under one roof, all with a strong focus on safety, reliability, and top-tier customer support.

Customer Reviews

Mileage Blocker Installation in Slough For Off-Road & Testing Use Only

Looking to prevent mileage from recording during dyno runs, testing, or off-road use? We provide professional installation of mileage blocker modules for a wide range of vehicles. All devices are supplied on the clear understanding that they are for off-road and motorsport purposes only, with no guarantees on detectability. Book your installation today at our Slough performance facility.

5-Star Google Reviews

0 +

Years of Experience

0 +

Customer Satisfaction

0 %

Why Choose Onyx Performance for Servicing?

Experts in Performance Cars

We know how to properly care for performance, modified, and luxury vehicles. Our team has the skills and experience to handle specialist requirements confidently.

Correct Service Schedules

Every service follows the exact schedule recommended by your vehicle’s manufacturer, helping maintain performance and protect your warranty.

Quality or OEM Parts

We only use high-quality aftermarket or original manufacturer parts, ensuring long-lasting reliability and top-level performance.

Full Vehicle Inspection

Our service goes beyond just changing oil. We inspect all key systems to keep your car safe, smooth, and road-ready.

Honest Advice, No Surprises

With transparent pricing and expert recommendations, you’ll always know what your car needs – no upselling, no hidden fees.

Fast, Trusted & Tracked

We offer quick turnaround, maintain service records, and send reminders – that’s why customers travel to us from across the UK.

Frequently Asked Questions

What is a mileage blocker?

A mileage blocker is a module that stops your car from recording mileage on the odometer and ECUs while driving.

Why would someone use a mileage blocker?

Primarily for off-road testing, dyno runs, and diagnostic purposes, where adding mileage is unnecessary.

Is a mileage blocker legal to use on the road?

No — mileage blockers are for off-road, motorsport, and testing use only. Using them on public roads may be illegal.

Can you guarantee mileage blockers are undetectable?

No — we give no guarantees that mileage blockers are undetectable. Dealer systems, diagnostic tools, or inspections may still detect usage.

How is a mileage blocker installed?

Our technicians fit the module discreetly, usually via a plug-and-play connection, without the need for permanent wiring changes.

Which vehicles can you install mileage blockers on?

We offer solutions for a wide range of models, including BMW, Audi, Mercedes, Porsche, Range Rover, and other high-performance vehicles.

Get a quick quote

Drop us a line! or Message us on WhatsApp

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.