Car Diagnostics | Book a Car Diagnostic for your BMW

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.

RAC Mobile Mechanics can carry out car diagnostics on popular BMW models such as 1 Series, 3 Series, X1, X3, and 2 Series. This service is completed at your home or workplace, following BMW maintenance guidance and using OEM‑equivalent parts. You get clear pricing, real‑time updates and a convenient, no‑hassle experience.

Close up of an RAC Mobile Mechanic underneath a car

Our top pick for your BMW

We’ll come to you at home or work

RAC Mobile Mechanic for your BMW

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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.

And it’s not just car diagnostics that we do for your BMW

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

Tyre King Autocentres Long Eaton

5.0/5

At Tyre King autocentres, we are your trusted local mechanics, committed to keeping you safe on the road. With years of hands-on experience and a team of fully qualified technicians, we specialise in delivering top-quality vehicle maintenance, repairs, and diagnostics at competitive prices. Our workshop is fully equipped with the latest tools and technology, allowing us to handle everything from routine servicing to complex mechanical issues—quickly, efficiently, and to the highest standards. Our Specialities We offer a full range of professional automotive services, including: MOT Testing (Class 4) Fast, reliable MOTs to ensure your vehicle meets all legal and safety standards. Servicing (Interim & Full) Regular servicing to keep your car running smoothly, improve fuel efficiency, and avoid costly repairs down the line. Brakes Complete brake inspections, repairs, and replacements using high-quality parts for your safety. Tyres Supply, fitting, balancing, and alignment of new tyres from leading brands. We also handle puncture repairs. General Repairs From cooling and exhausts to suspension and diagnostics, we fix it all—honestly and efficiently. Why Choose Us? . Experienced Technicians Our mechanics are highly trained and experienced with all makes and models. . Transparent Pricing No hidden costs. We provide clear quotes and explain all work before we begin. . Customer-Focused Service We pride ourselves on honesty, reliability, and friendly service. Your satisfaction is our top priority. . Quick Turnaround We know your time is valuable—most jobs are completed same-day. . Local & Trusted Proud to be part of the local community, with many loyal customers and 5-star reviews.

Phoenix Mills, Nottingham Road, Long Eaton, Nottingham, NG102AA

Southlands Autocentre

4.5/5

PROVIDING STRAIGHTFORWARD QUALITY AUTOMOTIVE CARE Southlands Autocentre has been established to offer customers quality workmanship, cost-effective solutions and delivery on-time. Our mission is to deliver a new level of transparent service and experience for customers not usually familiar to the vehicle repair and maintenance industry. All our workshops are fully equipped with the latest tools and hi-tech equipment, so vehicles are maintained to exacting manufacturer standards. We believe in providing customers with cost-effective automotive solutions and complete service transparency. We invest in the latest technologies to bring you a high-level of service. Our offering includes convenient hassle-free online bookings for MOTs, vehicle servicing and easy to use ordering system for tyres. Our workshop is equipped with the latest tools and hi-tech equipment, so vehicles are maintained to exacting manufacturer standards. We believe in providing customers with cost-effective automotive solutions and complete service transparency.

Southlands Farm, Stoke Road, Stoke Hammond, MK179BN

Manselton MOT Centre

5.0/5

Manselton MOT & Service Centre is a family run vehicle service and testing station, focused on providing you with truly outstanding garage services at the right price. At Manselton MOT & Service Centre, our experts can perform various garage services on your car or van. We can work on all makes and models of cars and light commercial vehicles. We will run tests to pinpoint the problem, fix the issue for you, and perform general maintenance on the rest of the vehicle to keep you running longer. Our general car and van servicing also covers tyre fitting and engine management. We aim to be your one-stop-shop for all of your automotive needs.

Unit 3 Cambrian Yard, David Street, Manselton, SA58NX

Pinewood Garage Ltd

4.5/5

We are a limited company garage based in Thatcham, Berkshire. Our garage of fully trained technicians with over 30 years of experience is highly equipped, enabling us to offer a comprehensive range of servicing and repairs for all makes and models of vehicle. We pride ourselves on our workmanship, delivering an outstanding level of customer service and providing value for money to our customers. When bringing your car to us, you can be sure to be receive knowledgeable, honest and friendly advice along with a prompt and high standard of service.

Pinewood Garage Ltd, Hermitage Road, Cold Ash, Thatcham, RG189JN

Brakes on Your Drive Ltd

4.7/5

At Brakes on Your Drive we carry out mobile servicing, brake pads & discs and tyre fittings, as well as much more! We are Registered Ferodo Brake Specialists. For 8 out of 10 cars we fit OE specification parts. Our USP is " WE COME TO YOU". All of our brake technicians have the facility to accept card payments or cash and issue an invoice on completion of the task. We have an excellent rating on Trust Pilot. DID YOU KNOW? "WE FIT TYRES ON YOUR DRIVE

Unit 22/23, Arkwright Court, Runcorn, WA71NX

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.