Book a Car Diagnostic in Croydon

Trustpilot rating for all RAC Mobile Mechanics.

Why choose the RAC for a car diagnostic?

With RAC Mobile Mechanics, you can avoid the hassle of taking your vehicle to a garage. They can do a vehicle diagnostic check on your driveway, so you don't even need to leave the house.

When it comes to diagnosing issues with your vehicle, our friendly expert mechanics are here to help. We use state-of-the-art diagnostic equipment to accurately identify any problems, ensuring your vehicle runs smoothly and safely. The price includes the diagnostic service – no hidden costs. Just friendly, honest experts.

Close up of an RAC Mobile Mechanic underneath a car

Our top pick in Croydon

We’ll come to you at home or work

RAC Mobile Mechanic in Croydon

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At the RAC, we’ve got over 125 years’ experience in offering complete peace of mind® to our members. We’re best known for our breakdown service. And now – our new RAC Mobile Mechanics are here to help make every day motoring easier. If you need a service or repair, they’ll come to you at your home or work.

Close up of an RAC Mobile Mechanic running a vehicle diagnostic check

Book a car diagnostic

Our mobile mechanics will spend up to 30 minutes checking your car for faults and talk you through any repairs you might need and give you a report for your records. There are various ways we can check for faults, which could include plugging in to check your car’s onboard engine management system.

OEM quality parts

We use original equipment manufacturer (OEM) standard parts, which means every new part will be the same standard and same quality as the original part it replaced.

Mechanics you can trust

Our mobile mechanics are friendly, honest, and backed by the RAC.

Book a repair

It’s easy to book a car repair online. We bring the garage to you with RAC Mobile Mechanics, or find a trusted local garage. Common repair jobs include:

Clutch Replacement

We diagnose and repair clutch issues – whether your clutch is heavy or slipping, or you’re having trouble changing gears.

Alternator repair

We check and correct alternator faults to keep your charging system running smoothly.

Oil change

Oil is vital to a healthy engine, so it’s important to change it regularly.

Brake pads & Discs

If your brakes are making noise or you’re noticing reduced stopping power, it’s likely time to replace your brake pads or discs.

Average cost of a vehicle diagnostic by car make^

The RAC charges a flat rate for the cost of a car diagnostic but prices may change due to inflation. According to RAC data, the average cost of a car diagnostic is £87.

Make	Average price
Ford	£105
Vauxhall	£105
Volkswagen	£105
Peugeot	£104
Mercedes-Benz	£104
Nissan	£106
BMW	£107
Audi	£106
Renault	£104
Citroen	£104

^Average price quoted for RAC Mobile Mechanics from 01/01/25 to 31/03/25.

And it’s not just car diagnostics that we do in Croydon

Mobile mechanics bring the garage to you, saving you the hassle of getting your car to a garage. If you need a service or repair, they’ll come to you at your home or work.

A close up of an RAC mobile mechanic looking under the hood of a car

Try one of our RAC Approved Garages

View all garages

B&W Motor Company.

Welcome to B&W Motor Company From our convenient location in South Croydon, we aim to offer our customers peace of mind that we can cater for all aspects of maintaining their vehicles in a cost effective and friendly manner. We deal with all makes of cars and LCV’s whether they are Privately owned, Company or Lease managed vehicles. We are delighted to have been invited to join the national network of RAC Approved Garages. The RAC have been serving motorists since 1897, and as the motorist’s champion, it’s their duty to provide motorists with a network of independent garages they can trust, that’s why they set up the RAC Approved Garages Network. As an RAC Approved Garage we follow the RAC Customer Charter for Approved Garages. This means you will get: Honest pricing – All work will be explained clearly and the costs will be transparent Quality work – Any repairs done will meet the high standard set by the RAC Exceptional customer service – You’ll find the service friendly, straightforward and jargon free For more information about the RAC and the Approved Garages network, please visit: www.rac.co.uk/approvedgarages Our range of services offer a winning combination of affordability along with the highest technical and customer service standards; whether basic servicing, diagnostics, wheel alignment, brakes, clutches or air conditioning.

57 Brighton Rd, South Croydon, CR26ED

Kar Klinik SE26

Welcome to Kar Klinik, your trusted automotive service provider since 1999. Located in Sydenham, SE26, our family-run garage is committed to excellence in customer service and quality workmanship. We offer a comprehensive range of affordable car services tailored to meet the diverse needs of drivers throughout Sydenham SE26, Lewisham SE13, Brockley SE4, and the broader South-East London area. Experience the confidence and peace of mind that comes with a reputable garage known for integrity and expertise, dispelling common stereotypes and consistently earning the trust of our clients.

Unit 1, Abbey Trading Estate, London, SE265TW

Sutton Motors and Garage Limited

Sutton Motors and Garage Ltd is a reputable car repair and maintenance garage serving the Sutton area of South London. As a trusted local business, the garage provides a wide range of automotive services designed to keep vehicles safe, reliable, and roadworthy. These services include routine servicing, diagnostics, MOT testing, brake and clutch repairs, exhaust and suspension work, and general mechanical repairs. Mechanics at the garage are experienced and customer-focused, offering competitive pricing and professional expertise to address both everyday maintenance and more complex vehicle issues. Sutton’s busy roads and diverse driving conditions make reliable automotive care essential, and this garage plays an important role in meeting those needs for drivers in the Sutton community and surrounding areas.

292-300 Carshalton Rd Carshalton, Sutton, London, SM53QB

Motech

Motech are an independent garage based in South West London offering a wide range of garage services to all makes and models. We have a wealth of experience in the garage, with our mechanics coming from strong backgrounds in Peugeot, Ford, VW, Audi, BMW and Mercedes repairs.

43 Mitcham Lane, London, SW16 6LJ

SAIMitcham Ltd

At SAI Mitcham Cars we deal with various car services such as full MOTs, body repairs and spraying, mechanical work, tyre fitting, car sales & much more. Here at SAI motors we are best known for our MOTs, which we cover classes 4, 5 and 7. We take every second of care to ensure your vehicle has been tested properly and is road safe and legal. We are transparent and make sure not only we but you are happy with result, making sure you leave with a safe and sound vehicle.

Unit 19 Willow Lane Business Park, 3-9 Willow Lane, Mictham, CR44NA

Frequently asked questions on car diagnostics

How much does it cost to diagnose a car problem?

The cost you pay can vary depending on the type of car and how complicated the diagnostic test. Check with your mechanic for a quote.

Is a car diagnostic test worth it?

Yes, a diagnostic test may save you a lot of money. It finds issues early before they become costly repairs. It can also keep your vehicle running efficiently and safely.

Can I do a car diagnostic myself?

While you can buy a diagnostic tool, interpreting the results needs expertise. It’s best if you to have a professional mechanic perform the test.

How long does a car diagnostic test take?

Diagnostic tests take from 30 minutes to a few hours. This depends on what issues are being looked at.

What are common car diagnostic codes?

Common diagnostic trouble codes include:

P0300: Random/Multiple Cylinder Misfire Detected
P0420: Catalyst System Efficiency Below Threshold
P0171: System Too Lean (Bank 1)

These are general examples, so your car may have different codes. Always check with a mechanic so you get an accurate diagnosis.

Is a car diagnostic test necessary for a service?

Yes, they are. Regular diagnostics can help keep your car in good health. It makes sure that underlying issues are addressed quickly, so you can drive with peace of mind on the road.

Again, keep in mind that mechanics might have their own checklists. Chat with your mechanic to be sure that they address any specific issues you have.