Autotech vs Carcode: What to Compare Before You Buy a Mileage Blocker

By Paul · Updated

Short answer: Carcode and Autotech UK both sell mileage blockers, and the right choice depends on your car and how you’ll use it. We can only speak for our own products, so this guide sets out what we offer and the questions worth asking any supplier, including us, before you buy.

Table of Contents

See the difference for yourself: we photographed our blocker next to a Carcode unit, plugs, pins and wiring side by side. Why Our Mileage Blockers Cost a Little More.

What to compare between suppliers

Most mileage blockers work in a similar way: a module plugs into the car’s wiring and, while it’s switched on, pauses mileage recording for testing or off-road work. The real differences between suppliers are in the details:

  • Exact fit: is there a module made for your model and year, or a “universal” one?
  • Fitting: is it plug-and-play, with no cut wires, and can it be removed so the car goes back to standard?
  • Support: do you get a fitting guide, and can you speak to someone if you get stuck?
  • Warranty and returns: how long is the warranty, and can you return it if it isn’t right?
  • Delivery: where does it ship from, and how quickly?
  • How it’s sold: a supplier that markets its product as “undetectable” is encouraging the kind of use that’s illegal. That’s a warning sign.

What you get from Autotech UK

Autotech UK mileage blocker with its wiring harness

  • Model-specific modules: blockers for 600+ models, each matched to the car’s make, model and year.
  • Tested before dispatch: every module is checked in our UK workshop before it ships.
  • Plug-and-play: no cutting or soldering, and it can be unplugged to return the car to standard.
  • Fitting help: we send the fitting video and instructions for your car, and our team helps on WhatsApp on +44 7303 014892 if you need it.
  • Mobile fitting: in the UK, our fitter can come to you, with fitting from £150.
  • 12-month warranty on new modules, and a 28-day money-back guarantee. See our Delivery, Refunds & Returns Policy.
  • Delivery: free UK delivery, tracked express options, and worldwide shipping.

Not sure which module fits your car? Find your car, or message us on WhatsApp and we’ll check it for you.

Questions to ask any supplier

Whoever you buy from, these questions will tell you a lot:

  1. Is this module made for my exact model and year?
  2. Will my speedometer keep working, and could any warning lights come on?
  3. Do I get fitting instructions for my car, and who do I contact if there’s a problem?
  4. How long is the warranty, and what does it cover?
  5. Can I return it if it doesn’t fit or I change my mind?
  6. Where is it shipped from, and how long will it take?

For a fuller checklist, see our Mileage Blocker Buying Guide.

Lawful use comes first

Using a mileage blocker for dyno testing, track days and off-road use is legal in the UK. Using one to make a road car look less used, and then selling it, insuring it or handing it back to a finance company without saying so, can be a criminal offence. Any supplier you choose should be clear about that. See Are Mileage Blockers Legal in the UK?

FAQs

Can I swap a Carcode blocker for an Autotech one? Our modules are matched to the car, not to another brand’s module. Tell us your make, model and year and we’ll check which one fits.

Are mileage blockers undetectable? No product should be bought on that promise. See Are Mileage Blockers Really Undetectable? The Honest Answer.

What’s the difference between a blocker and mileage correction? See Mileage Blocker vs Mileage Correction.