Book a Car Diagnostic in Trowbridge

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 Trowbridge

We’ll come to you at home or work

RAC Mobile Mechanic in Trowbridge

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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 Trowbridge

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

Ricky Fenby Ltd

Here at Ricky Fenby we specialise in used van sales, class 4 and 7 MOT's and all forms of mechanical repairs, maintenance and servicing work. We have a team of three very highly skilled technicians, with main dealer experience and an auto electrician. ready to tackle your motoring needs. We are also RAC approved which means that we adhere to a strict code of conduct at all times and are audited on a yearly basis. We offer the following services; Servicing MOT Testing Class 4 & 7 Diagnostics Clutches Air Conditioning Recovery Available Tyres & Exhausts Lazer Wheel Alignment Timing Belts General Repairs Collection & Delivery Service Available Fully Equipped Mobile Workshop

Unit F1 Southgate, Commerce Park, Frome, BA112RY

Idover Garage

Idover Garage is a local, family run business with over 35 years in the business. Founder and Director Kevin Connor and his team have built an excellent reputation for providing top quality car repairs, servicing, MOT inspections, state of the art diagnostic and much more. Being based in the humble village of Dauntsey, we serve across Malmesbury, Chippenham, Royal-Wootton-Bassett, Cirencester, Swindon, Tetbury and the surrounding areas within a 20-mile radius. We offer a range of services including car repair, MOTs and car servicing with free collection and delivery. Our prices are very competitive and we pride ourselves on being reliable and helpful with good customer service. Call us today or use the online form to contact us for a free, no obligation quote. Our modern fully-equipped workshop, staffed by trained technicians, is in Dauntsey, Wiltshire, near the major towns of Chippenham and Malmesbury. We serve the SN15 postcode district, caring for vehicles from all the surrounding areas including Great & Little Somerford, Brinkworth, Royal Wootton Bassett, Lyneham, Foxham, Lea, Startley, Cleverton, Garsdon, Upper Seagry, Corston, Christian Malford and Rodbourne. We offer comprehensive vehicle repairs and servicing, MOTs, welding and fabrication, diagnostics and fitting new tyres, batteries and exhausts.

Unit 11 Idover Business Park, Dauntsy, Chippenham, SN154JJ

Wiltshire Tyre and Autocentre (Chippenham)

Wiltshire Tyres operates a mobile tyre service specialising in the supply and fitting of tyres including car, van, 4x4 and run flat tyres at your home or work address. We have a network of warehouses stocking thousands of great value tyres from all the major tyre brands. Simply choose your tyres, book online then one of our highly trained tyre fitters will appear at your door. We make buying and fitting new tyres in Wiltshire that easy!

Wiltshire Tyre And Autocentre Chippenham, London Road, Chippenham, SN153AZ

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

GR Auto Services Ltd

We are one of the largest family owned independent garages in Yate, near Bristol. GR Auto Services have been servicing, carrying out MOT's and repairing most makes and models locally for over 20 years. We score highly with our customer service surveys. Our customer satisfaction rate can be seen on the Good Garage Scheme website and it averages between 96 - 97%. GR Auto Services received an award in 2012 from a major lease company for over 15 years of exceptional service to them and their customers. Our receptionist boasts both male and female staff, and we offer a collection and delivery service with in a 6 mile radius. We use 3 diagnostic computers so we are very strong on engine diagnostics with most makes and models. At Eurorepar Car Service, we’re all about keeping you and your car moving with confidence. As a trusted network of local garages, we provide high-quality car maintenance and repairs tailored to your needs – all at competitive prices. With our exclusive Brakes for Life program and a 2-year parts and labour warranty, you can drive away knowing you’re covered for the long haul.* Ask your Eurorepar Car Service Centre to fit Eurorepar branded parts to qualify. Claims under the 2-year parts and labour warranty must be made at a Eurorepar Car Service Centre. Discover expert care, unbeatable value, and peace of mind – all under one roof. Ready to experience the Eurorepar difference? Request a quote or give us a call today! *Terms and conditions apply.

24 North Road, Yate, Bristol, BS377PA

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.