Book a Car Diagnostic in Brentwood

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 Brentwood

We’ll come to you at home or work

RAC Mobile Mechanic in Brentwood

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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 Brentwood

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 Front Autos Ltd

In Front Autos was established in 1994, We have a vast wealth of experience with most makes & models of cars & LCV's. We are members of the RMI, Bosch Auto crew, Lex Autolease preferred, Ford Blue oval club. Also a MOT class 4 test centre. Our services include, Air conditioning, Electronic Diagnosis & Full vehicle digital geometry.

8 Avenue Industrial Estate, Gallows Corner, Romford, RM30BY

BB Motors Solution Ltd TA Platinum Motoring.

Established in 2008 with over 7 years of experience, we are a well-known, locally run business based in Romford. We pride ourselves on providing an honest and reliable service throughout the local area. We are a small team of qualified and experienced mechanics offering a complete range of garage services. We undertake all car servicing and provide quality MOT testing and repairs as well as computer Diagnostics for all make and models As testament to the high standard of service and workmanship that we provide, we maintain many repeat customers and are highly recommended across the local Romford and Gidea park area. Want to find out if we can help you? Are you looking for a free estimate? Please feel free to contact us today.

376-392 Brentwood Road, Romford, Essex, RM25TD

AJ Servicing & Repairs.

AJ Servicing and Repair centre (formerly Moorings Garage) was taken over in 2013 by a group of main dealer management and technical personnel. The team have over 100 years of main dealer experience between them and offer the best main dealer alternative for all makes and models. AJ Servicing & Repairs provide Car MOT, Car Service, Car Repair services and Tyres in and around Essex including Harold Wood, Harold Hill, Romford, Gidea Park, Brentwood, Cranham, Hornchurch, Upminster, Billericay, Ingrave, Dunton, Bulphan, Warley, Herongate, Ingrave, Essex and beyond! The workshop has to hand the latest computerised technology and testing equipment for all makes of vehicles and is authorised under the government block exemption ruling to service all vehicles and still validate manufacturers warranties. We provide all types of car tyres and van tyres at very competitive prices and include wheel balancing services as well. We take pride in our quality workmanship and honest pricing policy and ensure that our highly trained technicians carry out all works not leaving the servicing to apprentices or semi skilled mechanics. All parts fitted are guaranteed and only the best quality parts are fitted . No additional work is carried out without prior approval thereby not giving any shocks on collection. Services available at this garage are : MOT Test (by appointment only) Engine tuning Suspension Servicing all makes Electronics Gearboxes Brakes Diagnostics Automatic transmission Exhaust Steering

The Moorings Garage, Arterial Road, Hornchurch, RM113UB

L V GROUP MOT AND SERVICE CENTRE LTD

L V GROUP MOT AND SERVICE CENTRE LTD MOTS TYRES BRAKES DIAGNOSTICS SERVICING ENGINE REBUILDS BODY SHOP AIR CON

Unit 4 Newlands End, Basildon, Essex, SS156DU

RJ PERFORMANCE LTD

Our Mission At RJ Performance, our mission is to provide top-quality auto repair services that exceed customer expectations. We believe in transparency, honesty, and delivering exceptional value to every client.

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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.