Book a Car Diagnostic in Wigan

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 Wigan

We’ll come to you at home or work

RAC Mobile Mechanic in Wigan

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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 Wigan

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

IN'n'OUT Autocentres Wigan

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!!

Robin Park Road, Wigan, WN50BU

Shaw Street Garage

Looking for an experienced and affordable car maintenance or repair garage in Bolton, Greater Manchester? Welcome to Shaw Street Garage in Bolton, we offer a full range of services to ensure your vehicle stays roadworthy and legal whilst providing you total peace of mind and the best value for money. Shaw Street Garage provide servicing, repairs and MOTs , the customer service received really is second to none. Our team always believe that the customer's needs are paramount. The company recently received a 'Certification of Achievement of Diversity award', further adding to their excellent reputation. All work performed is of the highest quality and whatever the problem with your vehicle, our highly-trained technicians are able to correct the fault efficiently, using diagnostic equipment and the latest tools. Complete maintenance from a major service to a change of clutch or exhaust can be provided by the team at Shaw Street Garage, and any make or model of vehicle welcome.

92-94 Shaw Street, Bolton, BL36HU

Fastlane Autocare - The Fast Fit Centre

Tyres, car parts, car repairs, vehicle diagnostics and much more - all from our auto mechanic experts Are you looking for a car mechanic garage in St Helens to repair, service or maintain your car? The Fastfit Centre team is on hand to help you with all of your car repair and servicing needs. We offer quality services and repairs at competitive prices for all customers at our garage based in the St Helens area of Merseyside. The FastFit Centre offers a wide range of car repairs and services; including, but not limited to: tyre replacements and puncture repairs, full servicing for any vehicle, diagnostics using the latest software and main dealer specific technology, engine re-builds, electrical re-wiring, dash-cam installations, general car repairs and MOTs. We carry out each repair and service using quality parts and main-dealer, level specialist equipment. As an independent garage and leading stockist of tyres, parts and car accessories, we are able to offer our customers the very best service at unbeatable prices. We are also able to service and repair any vehicle which is still under warranty.

Fastlane Autocare, 232-254 Boundary Road, St Helens, WA102PZ

I C Automotive LTD

We are an established local independent garage and are proud to be members of 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. In short, we are a local garage you can trust offering you the support and service guarantees of a national network, giving you complete peace of mind. We offer an interest free payment plan through Payment Assist which takes the worry out of having to find all the funds to repair your car at the one time and offers you to pay this over 4 equal amounts with the first 1/4 coming out the day you sign up for the repair. Terms and conditions apply. Speak to a member of staff for more details. All free health checks are to be dropped off by 8:30am as this is a free service, We ask you not to be late. Thank You

Unit 1 Glover Street, St Helens, WA103LF

A P Fleet Services Ltd

Established In 2011, AP Fleet Services Ltd is the leading vehicle body shop in the North West. We offer MOT’s for class 4 and class 7 and offer servicing and mechanical repairs to vehicles. Our dedicated team have a wealth of experience and our onsite facilities are fully equipped to meet your vehicle’s needs.

Unit B, Lea Green, Ind Est, Lea Green Rd, Saint Helens, WA94QD

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.