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

Motamec Ltd

4.4/5

Here at Motamec Ltd we are a dynamic car and van mot and servicing centre situated on Moulton Park Industrial Estate in Northampton. Our team are dedicated to making sure that you the customer receive a first class service at affordable prices. We will only provide honest advice along with complete transparency as to why any work is required to be carried out on your vehicle. Our expertise lies in MOTs, vehicle maintenance, servicing and repairs, ensuring that our customers are constantly updated whilst their vehicle receives top-notch care. We aim to be the trusted choice for automotive care in the community hence our company slogan "trust the Motamec difference.

Unit 4 Encon Court, Owl Close, Moulton Park Industrial Estate, Northampton, NN36HZ

YDS AUTOMOTIVE

4.8/5

At YDS we offer General Maintenance and Servicing for all makes and models, while we specialise in the german vehicle industry we have the equipment, experience and knowledge to cater to any vehicle. Offering dealer level servicing at a fraction of the cost while still able to update digital and standard service records to preserve manufacturers warranty. Along side the every day stuff we offer all advanced and electrical diagnostics from running issues to audio problems we strive to get you that first time fix. And don't forget the fun stuff. At YDS we offer Varied packages with software and supporting performance hardware fully tailored to suit whatever you are behind the wheel of! Partnered with Performance companies and Payment Assist to make improving your car or van easier and more available than ever before!

Unit 5, Faraday Place, Thetford, IP243RG

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

Norwich Autoworks LTD,

4.5/5

We are based on Twickenham Road Norwich, NR6 6NG Near Norwich Airport. We cover all makes and models of cars, light commercial vehicles and motorhomes. From MOT Testing, Air Conditioning, Servicing, Repairs, Welding, Wheel Alignment, Tyres, Diagnostic Vehicle inspections and much more. We are a full class 4 & 7 MOT Test station for all makes and models of cars & light commercial vehicles up to 3500Kg. We are also Norwich's only independent Nissan Specialist garage. We are also registered with Payment Assist to be able to offer 0% Finance options to customers who wish to spread the cost of vehicle repairs should they need to.

6 Twickenham Road, Norwich, NR66NG

Dowden Motors

5.0/5

Welcome to Dowden Motor Services, where automotive excellence meets decades of trusted expertise. For over 40 years, we've been the go-to destination for drivers who demand the very best in vehicle care, maintenance, and repair services. What Sets Us Apart:- Four Decades of Excellence Since opening our doors in 1981, we've built our reputation on quality workmanship, honest advice, and exceptional customer service. Our experienced team combines traditional automotive knowledge with cutting-edge technology to deliver comprehensive solutions for all your motoring needs. Complete Automotive Solutions From routine servicing and MOT testing to complex engine diagnostics and specialist repairs, we offer a full range of automotive services under one roof. Whether you drive a modern hybrid, classic vintage car, or commercial fleet vehicle, our skilled technicians have the expertise to keep you on the road. Modern Facilities, Traditional Values Our state-of-the-art workshop features the latest diagnostic equipment and professional tools, while our service approach remains rooted in old-fashioned values of honesty, reliability, and customer care. We believe in building long-term relationships with our customers based on trust and consistent quality. Experience Matters With over 40 years in the automotive industry, we've seen it all. From carburettors to computerized engine management, from drum brakes to ABS systems, our experience spans the full evolution of automotive technology. Local Knowledge, Professional Standards As a local garage with professional standards, we understand the unique needs of our community while maintaining the highest levels of service quality. We're not just your garage - we're your automotive partners. Transparent, Honest Service No hidden charges, no unnecessary work, no surprises. We believe in clear communication, upfront pricing, and honest recommendations. Our reputation has been built on trust, and we work hard to maintain it every single day. Convenient and Reliable Located in the heart of Glastonbury, we offer flexible appointment times, while-you-wait services, and reliable work. Your time is valuable, and we respect that with efficient, professional service. Ready to Experience the Dowden Difference? Whether you need a routine service, urgent repair, or specialist advice, our team is ready to help. With four decades of experience and a commitment to excellence, Dowden Motor Services is your trusted partner for all your automotive needs.

Beckery Road, Glastonbury, Somerset, BA69NX

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.