Book a Car Diagnostic in Walton

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 Walton

We’ll come to you at home or work

RAC Mobile Mechanic in Walton

CDRSD-703_SEO500_-_Location_Page_-_Top_Pick_-_800x450.webp

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 Walton

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

Kingsbury Hampton

At Kingsbury Hampton, we’ve been proudly serving our customers for over 125+ years. Founded on strong family values and a passion for excellence, we’ve grown into trusted experts in the automotive industry. Our long-standing commitment to quality service and customer satisfaction is at the heart of everything we do. Whether you’re a new customer or a familiar face, we value every visit and strive to deliver the highest standard of care, every time.

45 - 49 Station Road, Hampton, Greater London, TW122BU

ARJ SERVICING

Our car repair service is your trusted partner for automotive maintenance and repairs. With a team of skilled technicians and state-of-the-art facilities, we prioritise precision and efficiency. From routine maintenance to complex repairs, we ensure your vehicle receives top-notch care, enhancing its performance and longevity. Our transparent approach includes detailed diagnostics and cost estimates before any work begins. Customer satisfaction is our priority, and we strive to exceed expectations with timely service and competitive pricing. Entrust your vehicle to us for reliable and professional car repairs that keep you safely on the road. If you want to find out more about what our expert team can do for you, contact us today.

Moated Farm Drive, Addlestone, Kt15 2Dw, The Barn, Moated Farm Drive, Addlestone, KT152DW

Mercury Cars (Ashford) Ltd

648 London Road, Ashford, TW15 3AW

HiQ Tyres & Autocare Ashford (Heathrow)

We are HiQ Tyre Expert Ashford London (Heathrow), your trusted local tyre expert and mobile service provider. Since opening our doors in 2018, we've proudly served the Ashford London (Heathrow) and surrounding communities within centre and mobile tyre replacement. We provide a full range of services to keep your vehicle in peak condition. From servicing to tyre fitting, wheel alignment, exhausts, brakes, and more, we have the expertise to handle all your automotive needs. Our team of qualified technicians use the latest equipment and technology to ensure every job is done right the first time. Our centre is located on the Feltham Road in Ashford London, but we are also conveniently located close to Heathrow Airport, Feltham, and Sunbury on Thames.

123 Feltham Road Ashford, Middlesex, TW151AB

Pkgarage Ltd.

At PKGARAGE Ltd. you are guaranteed the best service as well as cheapest labour prices. You can call or text us at any time in order to get the best car service you need. We specialise in mechanical and electrical car services as well as check ups. Our garage is fully equipped, in order to provide the best service for you.

Pkgarage Ltd., 5, Abbot Close West Byfleet, Byfleet, KT147JN

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.