A1 Diagnostics are experts in Engine rebuilds and Gearbox reconditioning

A1 Diagnostics have the experience and technical know-how to recondition and rebuild engines and gearboxes from all makes of vehicle, but we specialise in German manufacturers like BMW, Mercedes, Bosch, Audi, Volkswagen and more.


We are also known for our ability to stock engines and gearboxes from a range of manufacturers, so the chances are we will already have the part ready for you. The picture below shows our commitment to stocking engines and gearboxes for a huge range of vehicle types.


We offer competitive prices and have technicians who are highly experienced in the reconditioning of engines and gearboxes. As a result, we can save you hundreds of pounds on an engine or gearbox rebuild when compared to the cost of going to the dealer direct.

We offer a full supply and fit service on low mileage imported engines, gearboxes and turbos, with full 3, 6 or 12 month warranties on all parts. The real benefit of our in-house expertise is the ability to get you back on the road quickly. If we can’t fix an engine or gearbox problem, we can supply and fit a quality reconditioned part to get you back on the road.

Here at A1 Diagnostics, we also invest heavily in state-of-the-art equipment to diagnose engine problems quickly and efficiently. The result is hundreds of happy customers with rebuilt and reconditioned engines and gearboxes. Here is a handful of the testimonials we have received.


Mrs Collins

“Thanks for getting me back on the road so quickly.”

Paul Brent

“Thank you guys so much for servicing my AUDI R8 so quickly; we will see you in the future for a service.”

Mrs Senior

“Many thanks for fixing my Honda Jazz. The Staff were very helpful and co-operative. They explained the problem in detail before repairing the vehicle – and it was very reasonably priced too.”

Jane Wilson

“To A1, thank you for everything – my Mercedes is driving like a dream!”


Contact A1 Diagnostics

If you require any advice on any of the services mentioned above, or have any questions about your engine or gearbox, please get in touch using the contact details displayed below.


A1-Diagnostics and ECU Repairs
64 Sloper Road
CF11 8AB

Tel: (029 20) 220380
Fax: (029 20) 223172

Opening Times

Mon – Fri: 8:00am – 6:00pm

Email: info@a1-diagnostics.com

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