Book a Car Diagnostic in Cambridge

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 in Cambridge

We’ll come to you at home or work

RAC Mobile Mechanic in Cambridge

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.

Average cost of a vehicle diagnostic by car make^

The RAC charges a flat rate for the cost of a car diagnostic but prices may change due to inflation. According to RAC data, the average cost of a car diagnostic is £87.

Make	Average price
Ford	£105
Vauxhall	£105
Volkswagen	£105
Peugeot	£104
Mercedes-Benz	£104
Nissan	£106
BMW	£107
Audi	£106
Renault	£104
Citroen	£104

^Average price quoted for RAC Mobile Mechanics from 01/01/25 to 31/03/25.

And it’s not just car diagnostics that we do in Cambridge

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

Shire Hill Garage Ltd

4.9/5

Here at Shire Hill we use the latest diagnostic equipment, meaning that we can accurately detect what is wrong and suggest how best to make any necessary repairs. We specialise in clutch and electrical problems, and we also offer air conditioning diagnosis and repair. For honest, accurate services and affordable MOTs, bring your vehicle to Shire Hill Garage. We service all makes of cars and vans, with a highly qualified, experienced team offering a broad knowledge of different makes and models. rom cam belt replacements to air con repairs, Shire Hill Garage is the place to bring your car for extended maintenance and repairs. Just contact us for some friendly advice and to book your vehicle in for an appointment.

1 The Shires, Saffron Walden, CB11 3AN

Mitchells Motors Repairs Ltd

4.8/5

MITCHELL'S Motor Repairs is Haverhill's leading independent garage, the only AA & RAC Approved and Trading standards approved independent garage in the area giving you peace of mind. Here at MITCHELL'S we put the customers best interest in everything we do to give cost effective repairs & maintenance, exceptional customer service and have workshops with the latest diagnostic equipment and Technicians trained to manufacture standards. We have been serving the local community of Haverhill and the surrounding villages for 30 years with 3 generations on the Mitchell family working passionately within the business. As we say.... 'You're in safe hands'

20-22 Hollands Road, Haverhill, Suffolk, CB98PP

Cambridge Smart Cars

4.7/5

Cambridge Smart Cars LTD are a used car dealer and autocentre based in Fulbourn, Cambridge. We are proud to offer you a full range of services which include vehicle MOT, Servicing and Tyres at very competitive rates, so please have a look through our current stock or book your existing vehicle in for repairs and maintenance. At Cambridge Smart Cars LTD, we try to stock a range of used cars and even vans, we could find you your next vehicle, just let us know what you are looking for. We will go the extra mile to guarantee that you receive the best customer service and advice you need to keep your car safe and reliable. We have a great customer base and this is the reason many of our customers keep coming back to us.

3-6 Breckenwood Road, Fulbourn, CB21 5DQ

A G Toft Garage Ltd

4.4/5

We are a family run garage in the village of Bourn, Cambs. Our team collectively has over 100 years of experience and is dedicated to delivering every customer an outstanding experience. We specialise in welding and also major mechanical rebuilds, however, we cover a wide variety of repairs and services on all makes and models. All our parts come under manufacturer warranty. Established in 1985, our technicians are people you can trust for honest advice and trusty repairs. Throughout the process of repairs, we always keep you in the loop and discuss various options. We have local transport links nearby but if you wish to wait while we work on your car, we have a comfortable waiting room where you can enjoy refreshments and free WIFI.

Ag Toft Garage, 36 Gills Hill, Bourn, CB232TS

Winthorpe Ltd

3.5/5

If you’re looking for a reliable car garage in Ely or Littleport, look no further than Winthorpe Limited, we are specialists in a wide range of garage services including MOTS, Car Servicing, Car Repairs, Tyres and Car Batteries in Ely. Established in 2005, we provide an honest and reliable service at all times, proud to be recognised as a highly reputable car garage in Ely and Littleport. At Winthorpe Limited, we have worked hard to build a reputation for offering a trusted and “value for money” service to all our customers in Ely and Littleport. We understand the importance of good customer service, with the majority of our work gained through positive word of mouth and repeat custom. All of the services, repairs and MOTs are carried out under one roof allowing you to feel safe and confident that you and your vehicle are in expert hands and pride ourselves on the work that we do.

Unit 9 Chettisman Bus Park, Lynn Road, CB6 1RY

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.