How much is a car diagnostic test in the UK?

Experiencing squeaky car brakes or transmission issues? Then it’s high time to have your vehicle’s health inspected by a reliable expert. However, the car diagnostic test cost may be preventing you from doing so.

To help you prepare a budget for this kind of service, this comprehensive guide explores the factors that can affect costs. It also lists ways to lower expenses and explains what to look for when scouting a car diagnostics expert.

What are the average car diagnostic charges in the UK?

Calculator and toy cars on an auto expense chart (Source: iStock)

Listed in the table below is the average cost for a car diagnostic test across the country’s major cities:

*Prices shown are typical total costs per job based on recent Airtasker data. Actual costs may vary.

What factors affect the costs of auto diagnostic tests?

Don’t know why car diagnostic tests can sometimes get so costly? Here are the major factors that affect the amount you pay when hiring someone to perform the service.

Diagnostic test type

OBD2 scanner connected inside a vehicle (Source: iStock)

Simple tests that involve using an OBD-II scanner to retrieve error codes are usually affordable. This is because they are limited in what they can detect in terms of car problems and parts.

Meanwhile, more advanced and specialised diagnostic tests can check components such as the transmission, ABS, airbags, and other parts of the powertrain, chassis, and body. Consequently, a full diagnostic test on cars costs significantly more.

Vehicle type and technology

The cost of diagnostic tests for cars can also be influenced by make, model, and technology. A standard SUV from a non-luxury brand will probably not need specialised equipment for diagnosis. However, an electric hatchback may require specialist knowledge, more advanced software, and brand-specific diagnostic scan tools, leading to pricier service fees.

Required diagnostic tools and software

Laptop-based auto diagnostics in an open engine bay (Source: iStock)

Another factor that affects the price of a car diagnostic test is the kind of car diagnostic tools to be used. Simple ones, such as code readers, digital multimeters, non-contact thermometers, and fuel pressure gauges, don’t have a big impact on pricing.

However, connecting a professional-grade scanner to your car’s onboard computer or using high-end tools specifically designed for your vehicle typically increases the total cost.

Labour time and fault complexity

When a mechanic calculates a vehicle’s diagnostic test cost, they take into account both the complexity and the length of the work. This means you should expect higher diagnostic fees if your car has to undergo detailed testing to detect a problem that’s difficult to identify.

Service type: mobile vs workshop

How much is a car diagnostic test at a workshop versus at a location of your choice? Similar to a car wash or detailing services, diagnostics at auto repair shops can be slightly pricier than mobile services, since overhead costs are factored in.

However, your location and its accessibility can make mobile diagnostic charges higher than the average cost of a car diagnostic test; if you are in a remote area, a mechanic may charge additional fees for the time and effort required to reach you.

Additional testing or follow-up work

Car diagnostic check prices can increase if it’s necessary to conduct additional testing due to vague or unclear results. However, if follow-up work is required, such as electrical part replacement, diagnostic charges may be waived or lowered if you get your car repaired at the same garage or by the same mechanic.

What are some ways to save on vehicle diagnostic charges?

Vehicle dashboard with illuminated engine alert (Source: iStock)

Whether you have a used car or a brand-new one, you can save on car diagnostic costs through the following measures:

• Get quotes from different service providers so you can find and acquire the best deal based on your needs.

• If your vehicle is out of warranty, you can opt for an independent shop instead of a dealership garage since the former usually posts lower fees and labour rates.

• If the kind of diagnostic test your car needs is just simple, such as a check engine light scan, you can ask an auto shop or mechanic if they can perform the service for free.

What should you look for in a car diagnostics expert?

Here are some things to ask when looking for an auto mechanic or shop:

• Do they have the right certifications and licenses to operate and provide diagnostic services (e.g., business license, manufacturer certification)?

• Do they have the expertise, experience, and tools to conduct the diagnostic work your vehicle needs?

• Do they provide a service warranty?

• Do they have excellent reviews and ratings from past customers?

Detect car issues proactively with Airtasker

Mechanic checking vehicle diagnostics on a tablet (Source: iStock)

Whether your car has malfunctioning components or not, it’s essential to have it undergo regular diagnostic tests so you can catch problems early and avoid pricey repairs. And through Airtasker, it’s easy to find someone with the right capability, experience, and tools to inspect your vehicle.

After signing up on the platform, you can post a task specifying the service to be done, your location, your budget, and your target date. After Taskers begin responding to your post, you can choose the best one based on customer reviews and ratings.