Book a Car Diagnostic in Frome

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 Frome

We’ll come to you at home or work

RAC Mobile Mechanic in Frome

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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.

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

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.

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 Frome

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

Autocare MOT Centre

Riverway Trading Estate, Trowbridge, BA14 8LL

Wincanton Motorsport Ltd

We are a well-established workshop which has built up a fantastic reputation within the local area, since we first opened our doors in 1994. We carry out repairs, maintenance work, servicing and Class 1, 2 and 4 MOT’s on motorcycles, cars, light commercials and fleets. In 2008 we expanded the company and moved into a large 4000 square feet unit which has 4 service bays and an MOT bay. Our team of 4 technicians are fully qualified and have many years of experience within this industry. RAC approved. We use the latest diagnostic equipment, and use good quality parts to ensure that your vehicle remains in top condition at all times. This also means that we will not invalidate any existing warranties on your vehicle. We endeavour to make your experience as smooth sailing as possible and so offer our customers a free collection and delivery service within 2 miles, the use of our courtesy vehicles (subject to availability) or the use of our comfortable waiting room which has Wi-Fi and refreshments. All work comes guaranteed.

Wincanton Motorsport Ltd, Unit 10, 11-12 Hopkins Court, Bennetts Field Trading Estate, Wincanton, BA9 9TD

J Day Engineering

Your vehicle is in safe hands with our dedicated, highly skilled team. From initial booking through to key handover, our staff are on hand to assist with any queries, ensuring your vehicle remains in peak condition. J Day Engineering are proudly accredited by leading industry bodies, giving complete confidence in our workmanship and customer care. Motor Trader Independent Garage of the Yearand 2024. We utilise the very latest technologies and equipment to deliver service standards that exceed main dealers across the UK. This includes 2 x Hunter Hawkeye Elite alignment to allow commercial vehicle alignment, Hunter Quick Check Drive and Quick Tread Edge, advanced ADAS calibration systems, EV and hybrid servicing, and comprehensive diagnostics for modern vehicles.

J Day Engineering, Bow Bridge, The Marsh, Henstridge, BA8 0TF

Monster Gear Garage

We are an independent 5 star garage with high experienced technicians that will take care of your vehicle, we cover a wide range of repairs like: MOT MOT repairs Servicing Air Con Regas Air Con Recharge Brakes Tyres Clutches Timing belt / chain replacements Diagnostics Engine repairs / replacement Drive in with no appointment. If you wish to wait while your car is being repaired we have a luxury waiting area with TV, Wi-Fi and free hot drinks. Our garage is a comfortable place for you and your vehicle.

Bridge Road Ind Est, Unit 16 - 18, Bristol, BS154TA

Dowden Motors

Welcome to Dowden Motor Services, where automotive excellence meets decades of trusted expertise. For over 40 years, we've been the go-to destination for drivers who demand the very best in vehicle care, maintenance, and repair services. What Sets Us Apart:- Four Decades of Excellence Since opening our doors in 1981, we've built our reputation on quality workmanship, honest advice, and exceptional customer service. Our experienced team combines traditional automotive knowledge with cutting-edge technology to deliver comprehensive solutions for all your motoring needs. Complete Automotive Solutions From routine servicing and MOT testing to complex engine diagnostics and specialist repairs, we offer a full range of automotive services under one roof. Whether you drive a modern hybrid, classic vintage car, or commercial fleet vehicle, our skilled technicians have the expertise to keep you on the road. Modern Facilities, Traditional Values Our state-of-the-art workshop features the latest diagnostic equipment and professional tools, while our service approach remains rooted in old-fashioned values of honesty, reliability, and customer care. We believe in building long-term relationships with our customers based on trust and consistent quality. Experience Matters With over 40 years in the automotive industry, we've seen it all. From carburettors to computerized engine management, from drum brakes to ABS systems, our experience spans the full evolution of automotive technology. Local Knowledge, Professional Standards As a local garage with professional standards, we understand the unique needs of our community while maintaining the highest levels of service quality. We're not just your garage - we're your automotive partners. Transparent, Honest Service No hidden charges, no unnecessary work, no surprises. We believe in clear communication, upfront pricing, and honest recommendations. Our reputation has been built on trust, and we work hard to maintain it every single day. Convenient and Reliable Located in the heart of Glastonbury, we offer flexible appointment times, while-you-wait services, and reliable work. Your time is valuable, and we respect that with efficient, professional service. Ready to Experience the Dowden Difference? Whether you need a routine service, urgent repair, or specialist advice, our team is ready to help. With four decades of experience and a commitment to excellence, Dowden Motor Services is your trusted partner for all your automotive needs.

Beckery Road, Glastonbury, Somerset, BA69NX

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.