McLaren MP4-12C Mileage Blocker
The McLaren MP4-12C Mileage Blocker is a vehicle-specific plug-in module that connects behind the instrument cluster without cutting, soldering, or coding. It offers three selectable modes: 0% (complete stop), 10%, and normal operation. After removal, use of the device is not detectable through diagnostics.
Prices for this vehicle range from £699.00 to £999.00 depending on your generation and device version. Select your vehicle below to see the exact price.
Not sure which variant fits? Send us your car details before ordering — we'll confirm the right fit.
Include your vehicle make, model, model year or generation, and a photo of the instrument cluster if possible.
"Works exactly as described — fitted in under 15 minutes and does exactly what it says on the tin. Very happy with the quality."
— Doel N. · Verified buyer
Not sure which variant fits?
Send us your car details before ordering — we'll confirm the right fit.
Include your vehicle make, model, model year or generation, and a photo of the instrument cluster if possible.
"Ordered mine and it arrived quickly. The installation guide was clear and the unit works perfectly. Great UK support too."
— Joseph G. · Verified buyer
Delivery & peace of mind
DHL & FedEx tracked shipping12 months warranty30-day returnsKey features
- Quality connections — premium-quality plugs and heat-resistant cables for a neat, vehicle-specific fit.
- Discreet installation — integrates with the vehicle wiring at the specified fitting location.
- Fully removable — connects without cutting or soldering; remove cleanly at any time.
- Plug & Play installation — no cutting, soldering, or coding required.
- Control during testing — can be activated and deactivated while stationary or in motion during permitted off-road testing.
- Remembers the last setting — the active mode is retained between starts; no need to reactivate each time.
- No mileage catch-up — mileage not recorded while active is never added back when the device is removed.
- Vehicle-specific operating modes — the mode sequence depends on your selected generation and display type.
- Not detectable after removal — once removed, use of the device cannot be detected through diagnostics. Remove it before any diagnostic inspection.
- Mode-specific speed display — some active modes show a reduced speed; check the operating modes for your version.
Operation & Functional Modes
Push the speed limiter switch down and hold it for 5 seconds.
How it works
Every modern vehicle uses a CAN-bus network — a high-speed digital communication system that links the engine control unit, instrument cluster, gearbox, ABS, and dozens of other modules. Distance data travels across this network continuously, and the instrument cluster reads those signals to update the odometer.
The McLaren MP4-12C Mileage Blocker installs in-line on the specific CAN-bus line that carries distance pulses toward the instrument cluster. It intercepts those signals at the wiring level — before they reach the cluster — and, depending on the selected operating mode, suppresses them entirely or reduces them to a set percentage.
The device uses vehicle-specific, original-type connectors and fits entirely within the existing wiring loom. No wires are cut, no soldering is required, and no coding or software changes are made to the vehicle. Removing the device restores the vehicle to its exact factory state.
Because the device operates at the physical wiring layer — not through the OBD-II port or any software interface — its presence cannot be detected by standard diagnostic equipment. It leaves no trace in the vehicle's fault memory and does not trigger any warning lights. The device retains the last selected mode between ignition cycles.
Important information
This product is designed for off-road, motorsport, dyno testing and vehicle development use. It should not be used to alter the recorded mileage of any vehicle being offered for sale. Please ensure your use is in accordance with the laws that apply in your country.
Compatible variants
Choose the matching model year, generation and any listed instrument-cluster, connector or equipment option before ordering. If the correct version is unclear, contact support before purchase.
- McLaren MP4-12C (2011 - 2014)
Specifications
Compatibility & installation
Use the fitting instructions for your vehicle and device version. Contact us before ordering if you need clarification about compatibility or installation.
Delivery & Returns
Shipping
Contact us for delivery options, dispatch times and return conditions. Warranty: 12 months.
Returns & Warranty
Warranty: 12 months warranty
Returns window: 30 days from delivery
Return method: By post — return shipping costs apply
Full details are in our returns policy.