Mat Armstrong tries getting his repossessed Bugatti Veyron into Top Speed Mode but just when he thinks it's fixed another thing goes wrong

Getting a Bugatti Veyron ready to hit its top speed sounds difficult enough, but for Mat Armstrong it turned into a never-ending battle against mechanical problems.

The YouTuber had spent months rebuilding his repossessed Bugatti Veyron and was finally ready to activate the car’s famous Top Speed Mode.

After solving fault after fault and rebuilding huge sections of the hypercar, success seemed to be within touching distance.

But just when everything appeared to be working perfectly, the Veyron found another way to stop him in his tracks.

Mat Armstrong finally unlocks the Bugatti Veyron’s Top Speed Mode

Getting the Bugatti supercar ready for a top speed run turned out to be a huge task.

Mat Armstrong rebuilt large sections of the car, refreshed the bodywork, repaired damaged components, and swapped the Veyron’s light blue accents for a satin metallic silver finish.

The biggest hurdle was unlocking Top Speed Mode.

Unlike most performance cars, the homemade Veyron requires a separate speed key that changes the car’s aerodynamic settings and lowers it into its high-speed configuration.

Rather than paying for an official replacement, Armstrong worked with an auto locksmith to create his own version after discovering the system appeared to use a simple mechanical key.

Even after that, the Veyron continued fighting back.

A blown fuse knocked out the indicators, a stubborn engine misfire kept triggering warning lights, and a TPMS fault threatened to stop the speed mode from activating altogether.

After countless hours spent diagnosing problems, replacing parts, and carrying out test drives, the dashboard was finally free from warning lights.

At the runway, Armstrong inserted the homemade speed key and gave it a twist.

To his relief, Top Speed Mode activated immediately.

Just when the Veyron is ready to go, another problem appears

With a clear dashboard, new wheels fitted, and the weather beginning to improve, Armstrong headed out onto the runway for a shakedown run.

He wasn’t planning to immediately chase the Veyron’s 253MPH top speed, instead wanting to gradually build confidence in the car.

Everything seemed to be going to plan, but then the rebuilt Bugatti Veyron broke down.

Despite driving more than 150 miles to the runway without a single major issue, the hypercar suddenly developed a fault and lost power.

The Veyron began shutting down unexpectedly and refused to run properly, leaving Armstrong and his team scrambling for answers.

Diagnostic checks suggested a potential communication issue involving the fuel pump control module, but the exact cause remained unclear.

It was another frustrating setback for a project that has already been plagued by gearbox pressure issues, electrical gremlins, and engine problems.

After finally getting the Veyron into Top Speed Mode, Armstrong was once again left wondering what had gone wrong.

The video ended on a cliffhanger, with the team trying to diagnose the latest fault before making another attempt to see what the rebuilt Bugatti can really do.