Car Diagnostics | Book a Car Diagnostic for your Mercedes

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.

RAC Mobile Mechanics can carry out car diagnostics on popular Mercedes models such as A-Class, C-Class, GLC, E-Class, and EQA. This service is completed at your home or workplace, following Mercedes maintenance guidance and using OEM‑equivalent parts. You get clear pricing, real‑time updates and a convenient, no‑hassle experience.

Close up of an RAC Mobile Mechanic underneath a car

Our top pick for your Mercedes

We’ll come to you at home or work

RAC Mobile Mechanic for your Mercedes

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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.

And it’s not just car diagnostics that we do for your Mercedes

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

NMJ Service Centre

5.0/5

NMJ Service Centre provides professional vehicle servicing, repairs, and maintenance. Our team of qualified technicians is dedicated to delivering high-quality workmanship and exceptional customer care for all. We utilise advanced diagnostic equipment to accurately identify and resolve any issues, ensuring your car performs reliably and safely. From routine oil changes and brake inspections to more complex repairs, we are committed to keeping your vehicle in optimal condition. Trust us for dependable and efficient automotive solutions.

Nmj Towcester Road, Old Stratford, MK196AQ

GJB Autos

4.2/5

Welcome to GJB Autos, we are a garage conveniently located on Littlestone Road New Romney. We serve the local community of the Romney Marsh and surrounding areas. We are proud to have been established since 1975, in North Street New Romney and moving to our current premises in Littlestone Road in 2015. GJB Autos have built a great reputation providing a professional and friendly service to all our customers. It’s important to regularly maintain and check your car, not only for your safety and the safety of drivers around you but it will also help to sell your car in the future with a comprehensive service history. GJB Autos offer a comprehensive range of services at our service center including engine diagnostics, servicing, brakes, tyres, air conditioning, ECU remapping and much more. With many years experience in the industry, we can carry out servicing on all makes and models of vehicle. GJB Autos is a VOSA approved MOT testing centre for class 1,2, and 4 and a registered member of the GoodGarageScheme.com RMI, Autofirst Network, RAC Approved/Accredited, we guarantee quality and efficient work at reasonable prices every time.

8 Littlestone Road, New Romney, Romney Marsh, TN288PL

Elsham Garage services ltd, Bosch Car Service

5.0/5

We are members of the Bosch Car Service Network which is a national network of independent garages. Our objective is to provide you with a friendly and professional service for all your motoring needs at a fair and affordable price, using Bosch and Original Equipment quality parts. Our garages are fully equipped with modern, innovative diagnostic systems for quick and accurate trouble-shooting. We are audited by, and accredited to the Trading Standards Institute (TSI) to guarantee that we maintain the high standards set by Bosch. You can rely on us for fast, expert and affordable vehicle servicing and repair work. For everything your car needs. At Eurorepar Car Service, we’re all about keeping you and your car moving with confidence. As a trusted network of local garages, we provide high-quality car maintenance and repairs tailored to your needs – all at competitive prices. With our exclusive Brakes for Life program and a 2-year parts and labour warranty, you can drive away knowing you’re covered for the long haul.* Ask your Eurorepar Car Service Centre to fit Eurorepar branded parts to qualify. Claims under the 2-year parts and labour warranty must be made at a Eurorepar Car Service Centre. Discover expert care, unbeatable value, and peace of mind – all under one roof. Ready to experience the Eurorepar difference? Request a quote or give us a call today! *Terms and conditions apply.

Barton Road, Elsham, Brigg, DN200LR

Kissane and Jeffries (Recovery Services) Ltd

5.0/5

Kissane and Jeffries are a well established rescue and recovery company operating in the West Midlands and have been in the trade for over 30 years with proven ability to carry out a professional and competent service. We are constantly upgrading our fleet of breakdown and recovery vehicles and equipment to keep up with today's demands for the best in the business to ensure we can serve you as quickly as possible when needed. We also have comprehensive vehicle repair facilities available for most makes and models with very competitive pricing structures and a quality of service that will make you want to use us again and again, our technicians are ATA accredited and our workshops are registered to the BSi PAS 80 Standard. Customer satisfaction is our priority and we are focused on delivering a quality service whether it be as a one off job for an individual customer or one of the many jobs we carry out some of our blue chip clients, each and every customer is treated with the same high level of care, this is demonstrated with our commitment to the standards of ISO 9001 and PAS43.

Station Road, Rowley Regis, Warley, B65 0JY

Brooklands Service Centre

4.7/5

Brookland's have been here for 30 years. We are proud in everything we do and carry everything out to a high spec. Brookland's technicians carry over 15 years of experience an have delt with many aspects of different makes and models over the year, they all carry the correct qualifications from MOT license's to NVQ 2&3. We ain’t afraid to to take on any job an work constantly around the clock the get vehicles back on the road the same day. We carry out a wide range of diagnostic test's and checks, to service and repairs we also do mot's. As on the other hand we also carry out a wide range of body work and repairs too..

162 Armley Road, Leeds, LS122TY

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.