Ahead of the Rest
Testbook T4
We are always striving to be one step ahead of the rest at Les Potts 4 Wheel Drive and in December 2002 we became the first independent service centre in the world to receive the Land Rover Testbook T4 diagnostic system. This is a diagnostic system with unrivalled benefits.
Online access using Land Rover’s GTR (Global Technical Reference) gives us the same technical bulletins, service recalls, electronic troubleshooting manuals & workshop manuals available to Land Rover main dealers.
From key fob programming and air suspension to interrogating illuminated dash lamps, all diagnostic and guided repairs can be carried out quickly and efficiently with Testbook T4 on the complete Land Rover model range from 1987 to date.

When Testbook T4 is connected to your vehicle it systematically interrogates the engine management control unit which is automatically reprogrammed with the latest software to meet changing specifications and legislation. This update can significantly enhance the performance of your vehicle.
Testbook T4 is updated monthly to accommodate any new models or changes in technical data. All vehicles can be checked by chassis number and matched up with any technical bulletins or service recalls. As part of the service schedule on Discovery 2 and Range Rover models from 1999 onwards, Testbook is used to detect any potential problems before they become a problem.

Testbook T4 also incorporates Land Rover’s acclaimed hand-held tester. Powered by the diagnostic plug on all vehicles from 1996, the hand-held tester is totally mobile and can diagnose all major Land Rover systems on and off the road.
In summary this leading edge technology combined with our award winning staff and customer service focus ensures that your vehicle is off the road for the minimum time possible.
"The first independent service centre in the world to receive a Land Rover Testbook T4".
