Book a Car Diagnostic in Chester

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 Chester

We’ll come to you at home or work

RAC Mobile Mechanic in Chester

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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 Chester

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

R.B Automotive

We are a local garage carrying out vehicle servicing and repair. With over 40 years combined experience with all makes and models you can trust your vehicle is in safe hands.

R B Automotive, Chester Road West, Deeside, CH51SA

IN'n'OUT Autocentres Liverpool

At IN’n’OUT Autocentres we offer fixed prices MOTs and Servicing for any make and model of car with no hidden extras. We are proud to be a ‘Which? Trusted Trader’ so we are really a garage you can trust. We also have a 5 Star Trustpilot reviews rating. We provide OEM parts and 12 months warranty on all parts and servicing. We only use premium Castrol oils in all servicing. Our services are all completed ‘while-u-wait’ so you have never have the inconvenience of losing your car for the day. You can watch your car as it is being worked on through the viewing window or sit back and relax in our clean and comfortable customer lounges with FREE Wi-Fi and coffee and read the latest magazines. Check out our latest reviews and BOOK NOW!!

Speke Hall Road, Liverpool, L24 9HW

Owen Automotive Ltd.

We are an established family run local independent garage and are proud to be members of the Autofirst Network – a nationwide network of independent garages operating to the Network’s 6 core values of Capability, Consistency, Care, Clarity, Cost Effectiveness and Customer Focus. For your added peace of mind we are members of the Motor Ombudsman service which is approved by The Trading Standards Institute. We cover the Wrexham postcode areas and offer a free collection and delivery service within 5 miles.” At Owen Automotive Ltd, we are experts when it comes to Renault cars. If you want your car to get the same level of care and attention as from a dealership, then you can bring your car to our garage. Whether you want to check the performance of your car’s engine or change the electrical wiring of your car, you can rely on the expertise of our technicians to get the job done efficiently. Through dedication and hard work, we have built up an impeccable reputation for offering a high-quality service. This is one of the reasons why so many customers from Wrexham and Chester come to us whenever there is a problem with their car. To discuss your requirements or to book your car in for servicing, talk to a member of our team today.

Unit 3, Rhosddu Industrial Estate, Wrexham, LL114YL

The Car Care Centre

The Car Care Centre has for nearly 40 years been building a wide and varied customer base founded on our commitment to you the customer. We pride ourselves in maintaining excellent quality, workmanship, customer service and a really great aftercare service. Our team of highly skilled personnel vary from MOT and Service Technicians to our time served Master Paint Technicians. All mechanical and body work is undertaken in house so this means that we really do class ourselves as a One Stop Shop. Established since 1971 the Car Care Centre is a member of the Good Garage Scheme who's aim is to provide customers with garages that they can trust to complete your car service competently.

44 Park Road, Dingle, Liverpool, L8 9RF

Lunts Heath Tyre and Exhausts

Lunts Heath Tyre & Exhaust is an independent, family run vehicle maintenance business, established over 25 years ago, based in Widnes, Cheshire. We offer a wide range of expert vehicle repair and maintenance services to all makes and models, from Mot Testing up to Class 4 & 7 vehicles and a range of affordable full and interim servicing plans, to mechanical repair and vehicle maintenance throughout Widnes, Cheshire, including replacement tyres, engine diagnostics, air conditioning and workshop repairs. We have earned a great reputation in the local area for the high quality of repair work and first class customer service we provide, and we offering all aspects of service and repair to the very highest standard using only genuine manufacturer parts. 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.

Glebe Business Park, Lunts Heath Road, Widnes, WA85SQ

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.