Car Diagnostics | Book a Car Diagnostic for your Toyota

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 Toyota models such as Yaris, Yaris Cross, Corolla, C-HR, and RAV4. This service is completed at your home or workplace, following Toyota 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 Toyota

We’ll come to you at home or work

RAC Mobile Mechanic for your Toyota

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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 Toyota

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

Edward Street Garage Crewe Limited

4.4/5

We are specialist diagnosticians — we take on the vehicle problems most garages won’t. Using the latest technology and dealer-level technical information, we can find faults just like the dealers do, giving you clear answers and solutions before any work is agreed. As an RAC Approved Service Centre, we work on all makes and models, including EV and hybrid vehicles. From free vehicle health checks and diagnostics to MOTs, servicing, brakes, cambelts, electrics and general repairs, we handle it all with experience and transparency. We can also manage your warranty for you with any warranty provider, taking the hassle out of claims. We only use genuine OEM parts on new car servicing to help keep your manufacturer warranty valid. For heavy vehicles and Class 7 MOTs, our Ignition Autos Ltd branch in Middlewich is equipped to take on your inspections too. We offer service plans, interest-free payment options, and a transparent approach: honest advice, clear pricing, no hidden costs, and you’re kept in the loop every step of the way. Drop into your friendly local garage in Crewe or Middlewich — we’ll take care of you.

Edward Street Garage (Crewe) Limited, Edward Street, Crewe, CW26HQ

Peterborough Car Services Limited T/A Velocity tech, Bosch Car Service

4.4/5

Bosch Car Service Garage Welcome to Bosch Car Service Garage, the only Bosch-authorized service center in Peterborough. We specialize in comprehensive vehicle repairs, maintenance, and diagnostics. Our expert technicians use advanced Bosch equipment to ensure your car receives the highest quality care. Why Choose Us? - Exclusive in Peterborough**: The only Bosch Car Service in the area. - Comprehensive Services**: From routine maintenance to complex repairs. - Advanced Diagnostics**: State-of-the-art equipment for precise solutions. Experience top-tier automotive care with Bosch Car Service Garage!

Unit A Peartree Business Centre, Enterprise Way, Peterborough, PE38YQ

Bridge Autocare

4.3/5

Bridge Autocare offers quality vehicle maintenance services in Milton Keynes. We have a team of skilled technicians who only use the latest diagnostic tools and equipment. Our technicians receive ongoing training to deliver the highest quality of service possible.

3 Bridgeturn Ave, Wolverton, Milton Keynes, MK125QL

Dino Motor Company Limited

5.0/5

We are a newly established garage, we are looking to build a healthy customer base, we operate on a commercial site located between the A30 and A33, perfect for commuters with our long oopening hours it is easy to drop off before work and collect after!. We specialise in servicing, and smaller jobs (Brakes, Suspension, Clutches, Gearboxes) but can do the major jobs aswell!

Brickhouse Farm Commercial Unit, Brickhouse Hill, Eversley, RG270PY

Malling Repair Services

4.6/5

Malling Repair Services were established in 1982. We offer a wide range of services to suit all your motoring needs - air con re-gas and service, full or intermediate service, diagnostics, welding, tyres, exhausts, brakes and suspension and MOT's for all vehicles up to 3.5 tonnes. With our dedicated friendly team of professionals we currently have over 100 years of combined experience and knowledge coupled with a company that has been established since 1982. When you bring your vehicle to our garage we are sure that you will be pleasantly surprised with our prompt and courteous service at very competitive rates. In our efforts to always improve our service and keep as up to date as possible with current legislation we enrol all staff members on various training courses. So far we have achieved the following accreditations. ISO9001 quality assurance and control procedures PAS43. Quality control on vehicle recovery meeting the EU standards PAS80 quality control and assurance on customer care and car servicing NHS17a/b quality control and traffic management procedures AC1 refrigerant handling for air conditioning These are just some of the accreditations we have achieved in our efforts to be the best at what we do.

Malling Repair Services Ltd, 34-38 Foster Street, Maidstone, ME15 6NH

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.