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

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

An Tyres & Company

4.4/5

We are glad that you took the time out to know more about us. We are AN Tyres, and we are the most popular auto garage in and around Maidstone. We started small in 2014, and as we grew in size and experience, our name came to be associated with the highest quality of car service in these parts of the country. We are actually our own competition as we strive to reach newer heights of customer satisfaction every day. If there’s anything wrong with your car, anything at all, we are the ones you should visit. Our service includes everything from engine to transmission, suspension to brakes, and even bodywork. It’s everything under one roof so that you don’t have to visit multiple garages. However, the thing that we are best known for is our collection of original, high-quality spare tyres. We can say it with confidence that you won’t find such a massive collection anywhere else in and around Maidstone. Our collection boasts of tyres from all the big players in the tyre industry- Bridgestone, Goodyear, Michelin, Pirelli, Dunlop and Nexen to name a few. That doesn’t mean that we have forgotten about the smaller but more affordable brands. Tyres from Hankook, Falken and Avon also find a place on our shelves. Many people also visit us for their car’s MOT certifications. We are an authorised centre for performing an MOT test and issuing certificates. Our mechanics will also prep your vehicle for the test if it is guidance that you seek. Split in Blackjack, aces and Eights, but never two picture cards or tens. Also, remember that insurance is detrimental to you. So never use Insurance, because the math is just against you. Its best to forget that the option of insurance exists at all. All places at the Blackjack table are the same, and the cards do not favor a particular one. Only superstitious players think that. Similarly, there is no hot or cold table or Dealer. Besides, you shouldnt believe in anything like luck or bad luck. Do not play continuously, but take breaks to rest. Set a certain budget for your blackjack australia game from the outset and always set a maximum of 5% of it. So you have much longer of the game. If you take all these tips, then you will go much more often than a winner from the Blackjack table. All in all, whenever you think of repairing or servicing your car, or indeed replacing its tyres, think of us. You’ll receive a service that will be unforgettable for you in its efficiency and affordability. If you want to get in touch with us, call us on the number provided. We’d love to hear from you!

An Tyres, Square Hill Road, Maidstone, Kent, ME157TL

Burnt Tree Autocentre Ltd

4.3/5

We are based in Dudley, Burnt Tree, and have a combined experience of over 40 years. From Car Repairs, Tyres, MOT and so much more. What ever you are looking for, get in touch or give us a call on

102 - 104 Birmingham Road, Dudley, DY14RF

WINNERS CK LTD

5.0/5

Welcome to Winners, your premier destination for all automotive needs in Kettering! Located at 3 Alexandra Street, we proudly feature a top-tier MOT Center, a reliable auto repair workshop, and a state of-the art car wrapping service, providing you with unparalleled convenience and exceptional services. We are especially proud to work with NHS, UNITE, and offer Members Discounts for UK. customers, ensuring our services are accessible to everyone. Our dedicated team of professionals is passionate about delivering outstanding customer service and high-quality workmanship. At Winners, we take pride in exceeding your expectations. Whether you need comprehensive auto repair services, a reliable MOT, or want to transform the look of your car

3 Alexandra Street, Kettering, NN160SX

Keep Driving Auto Ltd

4.9/5

Here at Keep Driving Auto we provide a first rate, friendly garage service. Serving the Swansea area, located in Llansamlet within easy reach of both the city Centre and Swansea Enterprise Park.

Unit 7 St Lukes Court, Clarke Way Swansea Enterprise Park, Llansamlet, Swansea, SA17ER

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.