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

Power Evolution Performance

4.1/5

- We specialise in BMW, MINI & German motor vehicles. - All makes and models welcome. - N47 & M57 Diesel timing chain specialists.

20 Reading Arch Road, Redhill, Surrey, RH11HG

Cunningham’s Autocare And Recovery

4.7/5

A newly established company with over 20 years experience specialising in vehicle repairs and recovery, certified and audited by the AA! All types of work carried out from safety checks to clutches and cambelts. We offer a fully insured collection and delivery for your vehicle (subject to availability) in order to not interfere with your busy schedule. Only top quality parts used which also come with a 12 month / 12 thousand mile warranty. PRICE PROMISE! If you are shopping around for quotes and we are not the cheapest, don’t rush in! Give us a call back and we can see if we can beat it with our price promise!

Unit 39 Washford Industrial Estate, Redditch, B980DP

HiQ Tyres & Autocare Gosport

4.9/5

HiQ Tyre & Autocare Gosport, We are a local business that started from the ground up. As well as MOT’s and Servicing being our strength we are also able to offer Tyres for any vehicle, any size, any brand. In fact we do pretty much anything your car could ever need so if you’re unsure just give us a call. Reg and John the owners own and operate 3 HiQ’s across Hampshire and are experts in the industry with countless years of experience amongst them and the team. We are pleased to support our Military Personnel in Gosport and offer discount on production of ID. Our car care service offer includes Oil & filter service, interim and full car service schedules alongside Manufacturer Approved Warranty vehicle servicing. We also offer exhausts, brakes, clutches, MOT testing, car repairs, air-conditioning services, wheel alignment services and much more. Our team of mechanics and technicians work to the highest standard possible and are highly qualified to work on a range of various car and van marques. We are also proud to offer our customers excellent garage services at an exceptional price. Our trained technicians are very approachable and are able to provide expert advice in the best interest of your vehicle. We also offer Payment Assist so you can split your bill over several payments, however, this excludes payment for Tyres.

104 Fareham Road, Gosport, PO130BB

Approved engines ltd

4.5/5

at approved repair Centre we specialize in ford / psa vehicles we mainly do in-depth repairs head gaskets timing chains and belts as well as full engine builds and engine / gearbox changes . We have main dealer ford fdrs diagnostic computers and offer a main dealer level service on fords

Unit 2 Inca Business Park Acton, Acton, Sudbury, CO100BB

Shirley Car Care Centre Ltd

4.6/5

Based in Shirley, we are a family run company and give 100% customer satisfaction for all your vehicle needs. We specialise is Clutches, Semi-automatic gearboxes, Servicing, Mots, Welding, Air conditioning, Vehicle diagnostics and much more. Find us on Facebook for reviews and don't forget to like our page!

1 Vincents Grove, Southampton, SO155HW

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.