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.

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. Plus, when we’ve diagnosed the problem get £50 off mobile mechanic repairs over £150 – for a limited time only. ^†T&Cs apply. Offer ends 03/08, 23:59.

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

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

L.P Autos

4.3/5

L.p Autos LTD specialises in all vehicle makes and models. Our services range from servicing, diagnostics, Brakes, Suspension, Clutches, Engine repair. We are a family business and we take care of our customers as if they are part of that team.

Unit 5 Greenhalgh Street, Failsworth, M350BW

Bayley's vehicle locksmiths ltd

4.8/5

Bayleys Vehicle Locksmiths are an experienced, reliable and skilled local business based in Hove, East Sussex. We cover the whole of Sussex, Surrey and Kent and offer a 24 hour emergency response. VEHICLE LOCKSMITHS – VEHICLE REPAIR – MOT AND SERVICING WE OFFER COMPLETE KEY CUTTING AND CODING FOR MOST VEHICLES, INCLUDING HGVS & LGVS. HAVE YOU LOST YOUR HGV KEY OR NEED A SPARE ONE? WE COVER THE WHOLE OF SUSSEX, SURREY, AND KENT AND OFFER A 24-HOUR EMERGENCY RESPONSE. WE PROVIDE A FULL CODING SERVICE– ECU CODING – BSI UNITS AND CIM UNITS. ALL DONE AT OUR WORKSHOP OR WE CAN COME TO YOU. We offer complete Key cutting and coding for most vehicles, including HGVs & LGVs. Our team of experts can get your car fixed up in no time, so you can get back to your busy schedule. We also offer MOT and servicing services, so if your vehicle is due for its annual check-up, give us a call! Our expert technicians are only a phone call away when you need them!

Unit 1 D, Cambridge Grove, Hove, BN33ED

Weston Auto Centre

4.4/5

We are a family run garage, we put our customers first. Check out our reviews on the best of cannock and our facebook page

Unit 6 Bennick Industrial Estate, Broad Street, Bridgtown, WS11 0DA

Maidenhead Auto Repair Centre

5.0/5

Maidenhead Auto Repair Centre are an established local independent garage and are proud to be members of Autofirst Network – a nationwide network of independent garages operating to the Network’s 6 core values of Capability, Consistency, Care, Clarity, Cost Effectiveness and Customer Focus. For your added peace of mind we are members of the Motor Ombudsman service which is approved by The Trading Standards Institute. In short, we are a local garage you can trust offering you the support and service guarantees of a national network, giving you complete peace of mind. Since 1985, we have been building our Maidenhead garage and investing in the latest equipment so that we’re always one step ahead. We specialise in all makes and models of vehicles for Servicing, Mechanical Repairs, Bodywork and Accident Repairs plus MOT’s, Valet Services and Fleet Cars, which has enabled us to become the largest independent auto repair centre in Maidenhead. Our Maidenhead repair workshop is fully equipped with the latest technology to carry out all types of mechanical work from routine servicing to major overhauls and repairs. We accommodate four separate working bays all with hydraulic lifts and exhaust gas extraction. Each station employs its own fitting bench and full set of tools For body work, all spraying is carried out in our Nova Verta Booth which is large enough to accommodate all cars and Light Commercial Vehicles (LCV’s). We also have built in infrared heaters which allow the booth to perform low temperature baking to ensure a durable finish. If you’re looking for bodywork repairs in Maidenhead, then you’ve come to the right place.

M.A House, Cordwallis Street, Maidenhead, SL6 7BE

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.