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BookMyGarage is a free comparison and booking platform. You book here - the garage does the work, and you pay them directly.

3,119+BMG verified garages offering Diagnostic Checks

28 Million+drivers compared prices to book

273k+Verified customer reviews

A diagnostic check is a simple way of helping you regain confidence when something doesn’t feel right with your car.

A technician will plug a diagnostic scanner into your car to read fault codes logged in the engine control unit (ECU). They can then interpret the codes to find and fix your car’s problem.

2026 UK Diagnostic Check Costs

Min	Max	Range
£20	£159	£139

Data taken from bookings made at live garages on BookMyGarage.com in the last 12 months. Last updated 19th June

When Should I Book a Diagnostic Check?

If your engine management light is illuminated, you should look to book a diagnostic check as soon as possible.

This can come on for hundreds of reasons, so you’ll need a professional technician to interpret the fault codes and give you clarity on which repairs your car needs, helping you make an informed decision.

We know how overwhelming it can be to not know what’s wrong with your car. That’s why we’re here to help you stay in control of your vehicle’s health.

Just enter your reg and postcode into the booking tool below to book a professional diagnostic check in under 60 seconds and find a garage that drivers just like you love.

Why Book with BookMyGarage?

BMG-Verified Garages Across the UK - local businesses that offer great value and consistently meet service standards. Look for the BMG-Verified badge to find the garages we’ve ensured meet our high standards for customer service, ratings, and reliability.
Compare & Book in Seconds - see your options side by side and choose the right garage for you. No jargon. No stress. No surprises.
We Show the Full Picture - all up front: prices, reviews, availability, and distance, so you can choose the right garage based on what matters most to you.
Real Reviews - genuine, verified feedback from drivers like you. Every review helps you book with confidence.
No Upfront Payment – we won’t ask for payment details when you book. Pay the garage directly once the work’s complete*.
Support Local Garages - we connect drivers with quality local businesses that keep communities moving.

*some mobile technicians (that come out to you) may require an upfront payment or commitment, please check this with them first.

These are just some of the reasons to choose BookMyGarage - enter your reg and postcode to see how we can help you make a confident, informed choice when booking your car's diagnostic check now.

Frequently asked questions

A diagnostic check can help to identify a range of issues, relating to the following components amongst others:

-Engine
-Battery
-Brake system
-Alternator
-Gearbox
-Exhaust
-Airbags
-Suspension

We recommend the garages we deem most relevant for you based on your selected product, postcode and the reviews of garages in your area, prioritising BMG Verified and Silver, Gold and Top Tier garages for added peace of mind.

You can change your filters anytime if one factor is more important to you than others – full transparency, full control.

We recognise the very best performing garages in your area with a Silver, Gold or Top Tier badge. These badges help you spot garages that deliver customer service that goes above and beyond for drivers, offering great value, high standards and satisfaction/high ratings.

We never ask for payment details upfront.

Once you’ve chosen your garage, you deal with them directly from start to finish, paying only after the work is complete – giving you full peace of mind.

Some mobile technicians may request some commitment or payment upfront to cover the costs of them coming out to you.rages we deem most relevant for you based on your selected product, postcode and the reviews of garages in your area, prioritising BMG Verified and Silver, Gold and Top Tier garages for added peace of mind.

You can change your filters anytime if one factor is more important to you than others – full transparency, full control.

The best option for you will depend on your priorities. That’s why we show prices, ratings, availability, distance and everything else you need to find the right value for you, not just the lowest price.

Absolutely. True value looks different to everyone so, whether you want the nearest garage, the best-rated option or the lowest price, you can use the Sort By menu in the top-right corner to compare results by Price, Distance, Availability or Reviews - whatever matters most to you.

You can change your booking details right up until the appointment date. You’ll find instructions in the confirmation email you received or in your BookMyGarage account. Your chosen garage will contact you to acknowledge the amendment and re-confirm your booking.

Garages marked as BMG Verified have been physically visited by our team and meet our clear service level agreement standards for ratings and reliability.

Garages set their own prices to deliver great value for every driver, based on their location, costs and special offers. We show every price upfront, so you can decide what represents the best value for you without any hidden fees or surprises.