If you’re wondering, “Are mileage blockers illegal?” — you’re not alone. It’s a question we get every single day.
And the answer might surprise you…
No, Mileage Blockers Are NOT Illegal — But It Depends on How You Use Them
Owning or installing a mileage blocker is completely legal in many countries — including the UK, the USA, and most of Europe.
Yes, you read that right.
These devices are designed for vehicle testing, dyno tuning, and speedometer calibration — not deception.
So What’s the Catch?
Using a mileage blocker to manipulate the odometer for fraud — like selling a car with rolled-back mileage — is illegal.
But if you’re a:
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Mechanic testing vehicles
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Car enthusiast doing performance tuning
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Driver participating in track days
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Workshop calibrating speedometers
Then you’re 100% within your legal rights to use a mileage blocker — as long as it’s off public roads.
Let’s Break It Down
| Action | Legal? |
|---|---|
| Buying a mileage blocker | ✅ Legal |
| Installing a blocker for personal testing | ✅ Legal |
| Using it on public roads | ❌ Illegal |
| Using it to deceive a buyer | ❌ Illegal |
You’re in a Legal Grey Area — Here’s What That Means
The law allows the purchase and use of these devices, but it prohibits fraud.
Think of mileage blockers like radar detectors — legal to own, but illegal to abuse.
Legal for testing and calibration
Illegal for resale deception
At Mileage Blockers UK, we’re transparent:
We sell these tools strictly for off-road, test-use only.
How Tyre Size Impacts Your Speedometer — and How Mileage Blockers Help
Changed your tire size? Even a small difference can throw off your mileage reading.
Our devices include adjustable modes — such as 10%, 25%, or 50% — to compensate for this, helping you maintain accuracy in testing scenarios.
Why Mileage Blockers Exist (And Why They’re Legal)
Modern vehicles use a CAN bus system — like a central nervous system — to record speed, mileage, and more.
Mileage blockers intercept this data during test phases, preventing it from being recorded where it shouldn’t — without interfering with other systems or triggering fault codes.
This is vital for accurate tuning and testing.
Looking to Buy a Mileage Blocker?
We supply tested, high-quality modules for:
Every module is plug-and-play, undetectable, and comes with full customer support — including live chat, voice, or video call assistance.
Don’t Just Take Our Word For It…
Thousands of satisfied customers trust Mileage-Blocker.co.uk for performance, privacy, and peace of mind.
“Absolutely flawless experience. Module works perfectly for dyno testing my M3. Clear instructions, great support.”
— James M., Verified Buyer
FAQ: Mileage Blockers & The Law
Is it legal to buy a mileage blocker?
Yes. Buying, owning, and installing one is legal for legitimate use.
When can I legally use one?
For testing, dyno tuning, or speed calibration in a controlled setting — not on public roads.
Will I get in trouble for having one?
No. Possession is legal. Misuse is not.
Where can I buy a legal, high-quality blocker?
Right here at Mileage Blockers UK — with expert guidance and support for every vehicle brand.
Final Word: Use Responsibly
Mileage blockers are legal tools, designed for professional use. If you use them honestly, you have nothing to worry about.
But if you use them to mislead others, that crosses the line — and that’s not what we stand for.
👉 Buy responsibly.
👉 Use ethically.
👉 Drive smarter.
Ready to Get Started?
Explore our range of premium modules at Mileage-Blockers.co.uk
Have questions? Chat with our team now. We’re here to help.
