Book a Car Diagnostic in Plymouth

£177.03

Average price for this repair in Plymouth in the last 30 days^

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 Plymouth

We’ll come to you at home or work

RAC Mobile Mechanic in Plymouth

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 Plymouth

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

RB Motors

4.1/5

RB Motors are a repair and service garage located in Holsworthy Devon and Bude Cornwall. We pride ourselves on doing a great job that is quick easy and efficient. We offer same day collection of your vehicle and instant quotes, give us a call for any further information.

Tyr Cars, Atlantic High Way, Bude, EX239JY

Roundabout & Moxham Garage

3.9/5

We are a well known independent garage situated in the heart of Yelverton. We are extremely easy to find and have many amenities local to us. RAC trading standards approved. FREE COURTESY CAR AVAILABLE !!

Moorland Villas, Yelverton, PL206DT

TyreMarks of Tavistock

3.7/5

At TyreMarks our aim is to be at the forefront and to lead the way to offer the best service and results in vehicle mechanical, electrical and diagnostic repair solutions. We run the very latest in diagnostic, ECU and emissions control equipment for just about any vehicle and manufacturer. This also includes many manufacture's own specific tools and software for Ford, BMW, VW, Audi, Seat, Skoda & Bentley, Vauxhall, Peugeot & Citroen. Our new premises in Westbridge Industrial Estate, Tavistock have given us exactly what we needed to become what we are today, with easy access and customer parking spaces at the front of the building, along with a massive parking area at the rear. A superb customer reception and waiting area, all fully compliant with disabled specifications including our toilets and a children's play area, a TV, Free WiFi and even a Free Coffee machine. Our new premises have given us the room to expand, not only our general mechanical services but also expand our specialist services even further, running 6 mechanical ramps (5 of which are rated to lift over 4 ton), a fully floating wheel free ramp to be able to offer a full 4 wheel alignment set up. Also we have 3 tyre fitting bays along with a separate room for our Stainless Steel Custom Exhaust fabrication for Powerflow, a specialist ECU repair and tuning room where we can actually open your ECU to update, repair damage, copy and clone, even clean up internal corrosion and water damage in our ultrasonic tank. We use the best products for your vehicle and we are a dealer for many leading manufactures including MICHELIN Tyres, BREMBO Brakes, SHELL Lubricants - that's correct we use Shell Oil as our standard workshop motor oil. Not many garages can say that. We are an RAC Approved Garage which shows the quality of our work and the parts we use. With the ever increasing issues with vehicle electronics, emissions and dash warning lights we have invested heavily in the latest equipment for repair, engine management, ABS, airbag, body control, TPMS (Tyre Pressure Management System) and emissions control systems, such as DPF's and EGR Valves. Our Hydroflow Carbon Cleaning Treatment along with our Off Vehicle DPF Cleaning machine run alongside our ever-increasing range of diagnostic tools and manufacture specific back up to help us stay at the forefront of our game. Our outstanding HYDROFLOW Engine Decarbonising Machine is amazing people with its results, whether its general maintenance or rectifying an array of faults including engine management faults, cleaning blocked DPF's and EGR valves. This helps to increase your MPG, reduce smoking exhausts, remove lumpy running and reduce high exhaust emissions, reducing flat spots, cleaning out sticking turbo's to name just a few. Our Hydroflow treatment has proven time and time again to improve all of these issues. With the new MOT regulations, a vehicle suffering from these issues can often make the difference between a pass or fail. We are a Powerflow Centre of Excellence and so can build you a full customised Stainless Steel Exhaust system from scratch. Whether you require a high performance system with a 200 Cell sports Catalytic Convertor, a standard replacement system or just a flexy section replacement, we can offer it. We fully tig weld every system in house for any car, van, tractor or even a generator and all our work comes with a Lifetime Guarantee. Just pop in and check out our new premises on Westbridge Industrial Estate, Pixon Lane, Tavistock to see what we can do for you.

Unit 5 Westbridge Ind Est, Tavistock, PL198DE

Mallock Road Garage

3.0/5

We are a local garage, servicing our local communtiy.

1A Mallock Road, Chelston, Torquay, TQ26AF

James & Aldridge Garage Limited.

3.0/5

James and Aldridge are based in Bude, Cornwall. We carry out Car Servicing, Car Repairs, MOT Testing, 24/7 Vehicle Recovery and Vehicle Transport and we’re now a Used Car Cornwall Dealership. Our Workshop is fully equipped with the very latest in servicing technology and all of our local car mechanics are trained to provide the highest level of vehicle care. We are now RAC Approved! The RAC have been serving motorists since 1897 and as the motorist’s champion, it’s their duty to provide motorists with a network of independent businesses they can trust. Being RAC approved, we follow the RAC Customer Charter. This means that every time you bring your vehicle to us you will get: • Honest Pricing – All work will be explained clearly and the costs will be transparent • Quality Work – Any car repair done will meet the high standard set by the RAC • Exceptional Customer Service – You’ll find the service friendly, straightforward and jargon free

Bude Stratton Business Park, Bude, EX238LY

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.