Car Diagnostics | Book a Car Diagnostic for your Lexus

Trustpilot rating for all RAC Mobile Mechanics.

Why choose the RAC for a car diagnostic?

At the RAC, we've got over 125 years' experience helping UK drivers. We have the skills and knowledge to keep your vehicle running.

Plus, with RAC Mobile Mechanics, you can avoid the hassle of taking your vehicle to a garage when you need a repair. We’ll come to you, at your home or work.

Close up of an RAC Mobile Mechanic underneath a car

Our top pick for your Lexus

Our top pick

RAC Mobile Mechanic for your Lexus

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.

A customer tending to her garage with an RAC Mobile Mechanic in the background

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.

Close up of an RAC Mobile Mechanic running a vehicle diagnostic check

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 Lexus

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

Active Tyres,Servicing & MOT

4.7/5

We're open 6-days-a-week: Monday - Friday : 8.30am - 6pm Saturdays: 8:30am - 5pm Sundays: CLOSED We are, above all, local people in local garages. Our commitment to quality services stems from the simple foundation that we’re members of communities that we care about. We’re all about honest MOT tests and vehicle services at honest prices. We're the leading fast-fit supplier of tyres in the country and carry stocks of over 600,000 products from leading manufacturers including Pirelli, Goodyear, Michelin, Continental and Dunlop

216 Bellingdon Road, Chesham, HP52NN

MP Automotive Service Centre

5.0/5

We can undertake all manor of works for all leisure and small commercial vehicles. We specialize in bmw’s with our head technician having over 15 years experience in the brand . We are a Registered MOT station offering servicing , maintenance ,organising bodywork , diagnostics , tuning and repairs. Collection and delivery services are available pre booked or sometimes same day where possible

Mp Automotive Service Centre, Rear Of Bush Hill Parade, Bury Street West, London, N99JS

T & K Motors

4.9/5

T&K Motors have been established for more than 30 years and are a helpful friendly garage, we carry out MOT’s, servicing and mechanical repairs on all makes and models of vehicles. We pride ourselves on offering main dealer quality of work, at independent prices, whilst ensuring that your warranty remains intact by using genuine or manufacturer approved parts, and are usually able to save you over 60% in price comparison. Our mechanics are fully qualified with many years of experience behind them in the motor industry, who take great pride in their work. Our services include the following; • All makes serviced to manufacturer's specification • MOT VOSA class 4 and 7 Car and Light Commercial • Air Conditioning re-charge and leak testing • Batteries/Alternators checked and replaced • Brakes pads and discs, brake fluid changes • Clutch replacement and repair • Cylinder Head repairs • Engine management light diagnostics • Exhausts repaired and replaced • Free vehicle health check • Fuel injection diagnostic/repair • Oil and filter changes • Suspension spring replacement specialists • Timing belts and water pump replacement • Tyres fitted, balanced and aligned • Van servicing and repairs • Free Vehicle diagnostic checks • Welding repairs to MOT standard • Warning lights diagnosed and reset * Car Service, Van Service, Commercial vehicle service

47-53 Green Street, Ayr, KA88BQ

Monster Gear Garage

4.5/5

We are an independent 5 star garage with high experienced technicians that will take care of your vehicle, we cover a wide range of repairs like: MOT MOT repairs Servicing Air Con Regas Air Con Recharge Brakes Tyres Clutches Timing belt / chain replacements Diagnostics Engine repairs / replacement Drive in with no appointment. If you wish to wait while your car is being repaired we have a luxury waiting area with TV, Wi-Fi and free hot drinks. Our garage is a comfortable place for you and your vehicle.

Bridge Road Ind Est, Unit 16 - 18, Bristol, BS154TA

Bismillah Garage Services Ltd

4.2/5

Bismillah Garage Services is a family business, well established and respected MOT & car service garage in Luton also supplying replacement automotive parts such as exhausts, brakes spark plugs, oil filters and tyres. We undertake car servicing and repairs that including computer diagnostics, brakes, clutches etc. Regular car servicing can extend the life of a vehicle considerably and can save money. We focus on providing an exceptional garage service with competitive pricing. We have been serving customers in the Luton for 15 years. We have an up-to-date, fully equipped test centre, with all the facilities to service and repair your vehicles. We have built a solid reputation in Luton for delivering high quality garage services tailor made to meet the needs of our clients. Much of our business comes from word of mouth and satisfied repeat customers.

2A Tudor Road, Luton, LU3 1RN

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.