A1 is part of the Cardiff City football community

We love this time of the year as it’s great to see all the Cardiff City supporters walking past our workshop back in their famous blue shirts for the start of the football season. Our sister company Major Motors has been based on Sloper Road opposite the old Ninian Park stadium and the new Cardiff City Stadium for the past 30 years, and they have heard every roar that accompanies a Bluebirds goals.




We are even lucky enough to have featured in TV footage as city banged in the goals at the Grangetown end at the old Ninian Park.


£20 MOT for all Cardiff City supporters

To celebrate being part of the Cardiff City community, we are giving every Cardiff City fan a reduced MOT price of £20 and a free health check on their vehicle. A1 Diagnostics has years of experience servicing vehicles of all dealer types, but particularly German manufacturers including BMW, Mercedes, Audi, Volkswagen and more.

Our reviews

Here are some recent reviews from a handful of our happy customers over the past couple of weeks…

Lucy Anne Evans

“The garage I bought my car from recommended A1 Diagnostics, so I came here with a brake pad problem that the team resolved straight away. They went above and beyond the call of duty by liaising with both my insurance company and the Audi garage on my behalf.

As a female I can find car garages quite intimidating, but the guys at A1 are all really friendly and welcoming. I was also able to wait in a lovely waiting area with a free coffee 🙂 I would definitely recommend this garage.”

Matthew Brown

“Really happy with my Fiat Punto repair after its MOT fail. I expected high costs due to the car’s age, so I’m delighted with the price of the service I received. I’m also really happy with how clean my car was when I collected it.”

Please click here to read more of our testimonials.

Review our work


Please click here to check out some of the work we have carried out over the past 6 weeks. This helps to demonstrate our diverse range of skills, including servicing brakes, rebuilding vehicle engines, recharging air conditioning systems and lots more.


Contact A1 Diagnostics

Get in touch for more information or book your car in for a service using the contact details 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

Read more:
A1 Diagnostics can fix fault code P261F71

A1 Diagnostics have all of the equipment needed to diagnose fault codes in Mercedes vehicles from our garage workshop pictured...