"Cutting Costs Not Corners To Save You Pounds"

100% IndependentUnaffiliated to BMW AG

No Red TapeNo Sales Targets to keep Franchise

Significant SavingsAverage of 60% cheaper labour rate

One Stop Workshop for Mini Cars

Mini Diagnostics

We have invested heavily in obtaining and maintaining all the manufacturer specific diagnostic tooling including the different eras of BMW Mini along with the best of the aftermarket equipment as well. Our technicians are all highly qualified and experienced in BMW & Mini vehicles. We keep our training up to date for the latest generation of BMW Mini cars and carry out refresher training on the classic and out of production models. Whether a minor or major problem, we guarantee we can find it.

Mini Code Scan; Mini Fault Code; Mini P Codes; Mini Engine Management Light; Mini Dash Warning; Mini ABS Light; Mini DSC Light; Mini DPF fault; Mini Smoke; Mini Noise; Mini DIS, Mini TIS, Mini ISTA, Mini Rheingold, Mini Autologic, Mini Bosch KTS, Mini Picoscope, Mini Rolling Road, Mini Smoke Pro, Mini Fault Finding, Mini Advanced Diagnostics

One Stop Workshop for Mini Cars

Mini Servicing

Mini Condition Based Service Schedules or Mini Service Interval Indicator Schedules to provide manufacturer approved maintenance.
OE Mini approved filters, parts & fluids. Independent specialist Mini servicing saving you pounds, we guarantee to be cheaper than the franchised main dealer.

Mini CBS Oil Service, Mini CBS Microfilter Service, Mini CBS Vehicle Check, Mini CBS Brake Fluid, Mini CBS Front Brakes, Mini CBS Rear Brakes, Mini CBS MOT Test, Mini CBS Spark Plugs, Mini CBS DPF, Mini SII Oil Service, Mini SII Inspection I, Mini SII Inspection II, Mini SII Brake Fluid, Mini SII Brakes, Mini CBS Servicing, Mini SII Servicing, Mini Maintenance, Mini Service Schedules

One Stop Workshop for Mini Cars

Mini MOT Testing

The Ministry Of Transport Test is an annual legal requirement for all vehicles 3yrs old and older. It should be thought of as the minimum standards of roadworthiness for a car. Like a lot of the main dealerships, we outsource MOT testing to a trusted MOT centre who don't gain any work from failure certificates and are therefore completely impartial. Unlike a lot of main dealerships, we don't charge a big premium for the privilege!

The Government sets a maximum price for MOT tests. Currently it is set at £54.85 for cars. We offer discounted MOT Testing with FREE retesting.

One Stop Workshop for Mini Cars

Mini Mechanical Repairs

We do it all! Mini Brakes, Mini Suspension, Mini Timing, Mini Steering & ELV, Mini Cooling, Mini Engines, Mini Gearboxes, Mini Clutches, Mini Flywheels, Mini Turbos, Mini EGR Valves, Mini Swirl Flaps, Mini Injectors, Mini AirCon, Mini Decarbonisation. You name it we can probably do it!

All aspects of Mini mechanical maintenance & repairs carried out using manufacturer approved technical data and fitting instructions along with OE manufacturer approved parts and fluids.

One Stop Workshop for Mini Cars

Mini Brake Disc Skimming

Pro-Cut Machine Brake Disc Skimming Works. Brake discs (even new ones) have defects, when we skim the disc surface it is completely matched to the vehicles hub to provide superior braking. Resurfacing the disc also allows maximum usage of the brake disc without compromising quality. Skimming elimates any warping or runout too and judder becomes a thing of the past.

Brake Disc Skimming is subject to a safety assessment which includes checking the disc thickness is sufficient for the process and that there is no indication of structural weakness. Prices start at £35 per disc

One Stop Workshop for Mini Cars

Mini Transmission Services

Did you know that automatic transmissions need servicing? It's often overlooked and there is plenty of misconceptions and misunderstandings on the topic. Ignore transmission maintenance and you'll be risking gearbox failure. We have researched the topic in great depth and our advice is to service your automatic transmission every 50,000 miles if you want a reliable gearbox. BMW have been known to imply that their automatic transmissions don't require servicing and are sealed for life units. We would suggest considering the question of what their definition of life is. Undoubtedly it is conveniently linked to the warranty period they offer on their cars.

Our opinion is that no fluid or filter has sufficient longevity to last the mileage expected of the car. Would you leave your engine oil unchanged? The transmission fluid performs a similarly important job of lubricating the gearbox internals.

Mini Transmission Flush, Mini Tranmission Fluid Check, Mini Transmission Filter Renewal, Mini Gearbox Service

One Stop Workshop for Mini Cars

Mini Tyres & Wheel Alignment

Grab a tyre bargain at DIAGNOSTICS.WALES, lowest price guarantee. Full range of Budget, Mid Range and Premium branded tyres including runflats. Timed fitting slots, free coffee & WIFI. Alloy wheel protection and wheel balancing as standard.

Quality state of the art wheel alignment equipment for accurate tracking setup. Mini Runflat Tyres, Mini Tyres, Mini Runflats, Mini Wheel Alignment.

One Stop Workshop for Mini Cars

Mini Rolling Road

Our Dyno Developments dynamometer rolling road adds huge benefits in our capabilities for diagnosis, tuning and exhausts. This allows us to diagnose and test faults in a safe offroad environment. South Wales' only BMW & Mini Specialist with an in-house rolling road.

A rolling road run will give peak power and torque figures available for power runs and tuning with pinpoint accurately not seen on legacy inertial based dynos as used elsewhere.

Mini Dyno Runs, Mini Dynamometer, Mini Rolling Road, Mini Power Runs, Mini Rolling Road Diagnostics, Mini Dynamometer Diagnostics

One Stop Workshop for Mini Cars

Mini Exhausts

DIAGNOSTICS.WALES have the equipment and skills to install and fabricate custom bespoke stainless steel exhaust systems meeting your specfic requirements. Alternatively we also supply & install systems from Larini, Miltek and other off the shelf performance suppliers.

Designed specifically around you and your vehicle. If you want loud no problem; if you want style no problem. 100% Full Lifetime Warranty. No Quibbles or Get Out Clauses - Our custom exhaust systems are fully warrantied for the lifetime of the vehicle.

One Stop Workshop for Mini Cars

Mini Performance Works

We pride ourselves on our experience at improving your already brilliant Mini by adding those extras that it's missing. Transform your BMW Mini from standard to extraordinary!

Mini Retrofits from dash cams, PDC, Trackers, Handsfree, Audio & TV. Mini Induction Upgrades from intake kits, performance air filters, intake manifolds, turbochargers & supercharger kits. Mini Engine Upgrades, Mini Suspension Upgrades (Mini Coilovers etc), Mini Brake Upgrades etc etc.

One Stop Workshop for Mini Cars

Mini Custom Tuning

Optimum Performance; Ultimate Power. Remapping designed to tune your Mini for its utmost balance of power and performance. Custom tuning tailored to you & your vehicle, we don't use an outside tuning company or simply resell someone elses maps, we tailor each and every tune/map to your vehicle.

We are the only South Wales BMW and Mini Specialist to provide a full tuning service on-site using our own rolling road with all remaps performed custom your vehicle in-house. Testing on the dynamometer allows us to confirm the results, whilst ensuring reliability and longevity are upheld.

One Stop Workshop for Mini Cars

Mini DPF Works

BMW Mini Diesel Particulate Filter issues are very common. Ignoring a DPF warning on the dash is tempting, especially when it resets, but this tends to lead to a non-runner. At DIAGNOSTICS.WALES we offer accurate DPF diagnostics and fault finding, we'll find the cause of the problem not just the result so that once fixed it doesn't happen again.

We offer a wide variety of solutions for DPF problems including Chemical Cleaning, Replacement & Removal of the filter. We can test and renew the DPF sensors too.

Mini DPF Chemical Cleaning, Mini DPF Cleaning, Mini DPF Restoration, Mini DPF Repair, Mini DPF Replacement, Mini New DPF, Mini DPF Sensors, Mini DPF Bypass, Mini DPF Delete, Mini DPF Removal

One Stop Workshop for Mini Cars

Mini Auto Electrical

Mini Auto Electricians, master level fully qualified and trained for auto electrical diagnosis and repairs. Wiring loom repairs, Wiring loom remanufacture and Wiring loom replacement all available at our workshop.

Batteries, Starter Motors, Alternators, In-Car Accessories, Security Systems, Fault Finding & Engine Management Diagnostics. All aspects of Mini Autoelectrical works undertaken.

One Stop Workshop for Mini Cars

Mini Software & Coding

Software Updates fix glitches & gremlins. Like windows updates on your pc, which you may or may not notice the point of, BMW modify their software with improvements and fixes. Keeping your car's software at the latest version actually keeps everything working at its optimum and resolves minor issues that have been identified.

Coding Works, Coding Activation & Modifications. If you want to activate a system you've added or changed, the coding will need to be modified and set up. We have all the tooling to modify the coding or activate a module on your Mini. Popular choices include "Deactivate Start/Stop" and "Convert to Non Runflat" but whatever you're looking for, we're likely to have done it before.

One Stop Workshop for Mini Cars

Mini ECU Testing & Repairs

South Wales BMW and Mini ECU Specialist. Our high tech in house electronics laboratory is set up for testing and repairing ECUs, Control Modules & Electronic Components. Our focus is on BMW & Mini ECUs and we stock all the components for repairs related to most models. We also hold a stock of the more commonly needed donor units.

ECU Testing is £80; Typical repairs cost in the region of £300; Donor Units tend to cost in the region of £450; A brand new unit without fitment of coding is likely to be over £1000

"Our Customers are pleasantly surprised at our pricing structure"

Mini Oil Service

  • Oil Filter Renewal
  • Oil Renewal
  • Pollen Filter Renewal
  • Service Data Reset

Mini Diagnostics

Initial Assessment Package
  • Dealer Level Code Scan
  • Up to 1hr Technician Time
  • Initial Checks & Testing
  • Written Report & Conclusion

Mini Rolling Road

  • Up to 4 Power Runs
  • Brake Horse Power Figures
  • Torque Measurement at the wheels
  • Graph Printout inc. Averages

Hourly Labour Rate

  • Qualified BMW Mini Trained Technicians
  • Manufacturer Approved Technical Data
  • Manufacturer Diagnostic Tooling & Equipment
  • BMW Mini Focused Experienced Expertise

Mini Convertible

Roof Fault

Mini Cooper D

Diesel Decarb Works

BMW Minis


Mini Cooper S

Head Gasket Failure

Mini One

Gear Selector Issues