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.

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

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.

A customer tending to her garage with an RAC Mobile Mechanic in the background

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.

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

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

Tyre World & MOT Station

4.6/5

TYRE WORLD WAS ESTABLISHED IN 1992 TO PROVIDE MOTOR VEHICLE SERVICE AND GREAT TYRE SERVICE IN LOCAL AREA. We do following services: 1. 4 Wheel 3D Alignment. 2. Tyre 3. MOT 4. Tyre Replacement 5. Mechanical Work

10-11 Williams Buildings, Bethnal Green, London, E20LF

Prestige German Cars - Independent German Car Specialist

4.2/5

BMW | Mercedes Benz | MINI | Volkswagen | Audi | Skoda | SEAT | Smart Welcome to Prestige German Cars, established in 2003 and located in the North East of England. Boasting a purpose built 8 bay workshop, we offer everything a main dealer can at reduced prices. It is a point of pride for us to have the latest BMW & VAG dealer diagnostics and more, plus the equipment required to carry out everything your vehicle requires, ensuring we are up to date with all the latest techniques and know-how. Of course other makes and models can be catered for too!!

11, Shaftesbury Ave, South Shields, NE349PH

Martin Pilley Services, Bosch Car Service

5.0/5

We are a member of the Bosch Car Service network which is a national network of independent garages. Each garage is well established in its own right and aims to keep its premises neat and tidy with clear Bosch Car Service signage, uniforms and equipment. We are an independently owned business with friendly staff, trained to fit or replace Bosch quality parts.To guarantee that we maintain the high standards that Bosch set, we are audited every year and, to ensure that our technicians are up to date with new technologies, Bosch insist that our staff attend training on a regular basis.With changes in European legislation it is possible to have your car serviced at an independent garage without invalidating your manufacturers warranty.In recent years, the advances in the technology in your car have been huge and Bosch is at forefront of this. They invented the Spark plug over 100 years ago, without which the petrol engine would not work, and have been involved in the advance of Diesel technology for over 75 years. One example of a Bosch invention is the lambda sensor which they invented 30 years ago.It is now used in both petrol and diesel engines, helping to make the car run more efficiently and reduces harmful emissions, helping to protect the environment. Another Bosch invention is ESP (Electronic Stability Program). Since its invention in 1995, over 20 million have been produced. It is now in 40% of new European cars, helping to prevent skidding.

6-11 Wick One Industrial Estate, New Milton, BH25 6SJ

Charlotte Street Garage

4.0/5

We are one of the leading independent vehicle repair, servicing & MOT testing centres in the area. As a registered member of the Good Garage Scheme, we are dedicated to providing excellent workmanship without compromising value for money.Our team of knowledgeable, experienced and professionally trained technicians offer a friendly and courteous service supported by state of the art equipment, ensuring your vehicle is in the best possible hands. Our facilities include servicing, MOT, brakes, batteries, exhausts, tyres, shock absorbers, suspension and all aspects of mechanical repair to your cars engine. We also have a on site body shop, that covers insurance jobs to miner dents in the body of your car.

Charlotte Street, South Moor, Stanley, DH9 7AT

A52 Tyre Barn ltd - Auto centre

4.0/5

Family run business. Been established for 10 years. Auto centre - repairs and servicing all makes and models Mot testing centre - Class 4 & 7 New and used tyres Engine diagnostics Alloy wheel refurbishment Four wheel alignment / tracking Exhausts Brakes , suspension work

Tyre Barn , Grantham Road, Whatton, Nottingham, NG13 9EW

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.