EV Battery Diagnostics – What Can THINKCAR Actually Tell You?As more electric vehicles enter UK workshops, diagnostics is starting to go beyond simply reading and clearing fault codes.
One of the biggest questions with any used or ageing EV is the condition of its most expensive component:

The high-voltage battery.
So what can THINKCAR actually tell you about it?
EV Diagnostics Are Already Part of THINKCAR It's worth clearing up one thing first.
You don't need a dedicated EV tool just to diagnose an electric vehicle with THINKCAR.
Our professional diagnostic platforms already provide EV diagnostic and service capability, allowing technicians to communicate with systems across vehicles such as Tesla, Volkswagen ID models, Nissan Leaf and many others.

For workshops wanting to go further, THINKCAR's dedicated EV diagnostic capability allows much deeper analysis of the high-voltage battery itself.

What Is EV Battery State of Health (SOH)?State of Health — usually shown as SOH — is an indication of the condition of an EV battery compared with when it was new.

That's becoming increasingly useful information for workshops.
A vehicle might drive normally and have no obvious battery warning, but that doesn't necessarily tell you how the battery has aged or whether individual cells are behaving as expected.
With THINKCAR's EV battery diagnostic capability, technicians can access information including:

• Battery State of Health (SOH)
• Individual cell voltages
• Cell voltage differences
• Battery temperatures
• Charging and discharging information
• High-voltage battery data

Rather than guessing at battery condition, you've got actual vehicle data to work with.
See THINKCAR EV Battery SOH Testing in Action

​This demonstration shows how THINKCAR can access EV battery information and give the technician a clearer picture of what's happening inside the battery pack.
What Does This Look Like on a Tesla?Here's a real example from a Tesla tested using THINKCAR diagnostics.

The important part isn't simply producing another diagnostic report.
It's being able to give the technician useful information about the vehicle and its high-voltage systems that can be saved, reviewed and used as part of the diagnostic process.
For workshops working with used EVs, battery faults or customers concerned about battery condition, this type of information is only going to become more relevant.

Going Deeper With the THINKCAR EV PackFor workshops specialising in EV work, the THINKCAR EV Pack takes diagnostics beyond normal vehicle communication.

It provides access to individual battery cell information and detailed battery data, with the ability to test supported battery packs outside the vehicle.

The EV Pack is included with professional platforms including the Thinkcar 394 and Thinkcar 399, and is available as an upgrade for selected other THINKCAR professional diagnostic platforms.
EV Diagnostics for UK WorkshopsEVs aren't something workshops can keep treating as a job for the future.

They're already coming through the doors.
The question is whether your diagnostic equipment gives you enough information to confidently work on them.

From everyday EV fault finding through to high-voltage battery diagnostics, State of Health testing and individual cell analysis, THINKCAR gives independent UK workshops the ability to take EV diagnostics further.
And as always, official Thinkcar UK equipment is backed by our UK technical support and authorised dealer network.

THINKCAR UK — Smarter Diagnostics. Stronger Support.

Why THINKCAR? More Than Just a Name on a Diagnostic Tool

When you're choosing professional diagnostic equipment, it's easy to compare screen sizes, functions, vehicle coverage and subscription costs.
But there's another question worth asking:

Who actually makes the tool?
THINKCAR Is a Diagnostic Equipment ManufacturerTHINKCAR isn't simply a brand name applied to somebody else's diagnostic equipment.
Behind the THINKCAR name is a diagnostic equipment manufacturer with its own R&D, engineering and manufacturing capabilities.

From hardware and vehicle communication through to diagnostic software and new technology such as AI-assisted diagnostics, THINKCAR is actively developing the products that carry its name.
And that matters.

Because professional diagnostic equipment isn't just a tablet in a rubber case. The real value is in the software, vehicle coverage, communication hardware, updates and continued development behind it.
From Development to ManufacturingTHINKCAR has its own manufacturing facilities, producing and testing diagnostic equipment before it reaches workshops around the world.

​

For us, that's an important distinction.
You're not buying from a company that has simply sourced a generic diagnostic tablet and put a THINKCAR badge on it.

There's a manufacturer behind the product.
Developing the Next Generation of DiagnosticsVehicle diagnostics doesn't stand still.
Secure gateways, DoIP, CAN FD, EVs, online programming, remote diagnostics and now AI are changing what workshops expect from professional diagnostic equipment.

THINKCAR continues to develop its diagnostic platform alongside those changes.
You can already see that with products such as the Thinkcar 399, remote diagnostic and programming capabilities and the introduction of AI-assisted diagnostics.

THINKCAR Globally. Supported Locally.The other half of the story is what happens once that equipment reaches a UK workshop.

That's where Thinkcar UK and our authorised UK dealer network come in.
We combine the technology and development of a global diagnostic manufacturer with UK-based knowledge, technical support and training.

So when you choose THINKCAR, you're not simply choosing another diagnostic tablet.
You're choosing the manufacturer behind it — with UK support behind you.
Why THINKCAR?Professional diagnostic equipment developed for professional technicians.
​
THINKCAR UK — Smarter Diagnostics. Stronger Support.

​​AI is everywhere at the moment. But what does it actually mean when we talk about AI in vehicle diagnostics?

For a technician, it doesn't mean plugging a diagnostic tool into a vehicle and letting AI magically find the fault.
It's much simpler than that.

AI can help you make sense of the information you've already got — fault codes, symptoms, live data and other vehicle information — and help point you towards what to check next.

A Practical ExampleImagine you've got a vehicle in the workshop with several fault codes.
You can read the codes with your diagnostic tool, but that's only the starting point. Which fault is actually causing the problem? Are some of the other codes a consequence of it? What should you test first?

This is where AI can be useful.
Instead of searching through information manually, AI can help interpret what's in front of you and suggest possible causes or areas to investigate.
​
You still test it.
You still prove the fault.
You still make the diagnosis.

Will AI Diagnose the Car for You?Not quite — and that's an important distinction.
At Thinkcar UK, we see AI as another tool available to the technician, rather than something that's there to replace their knowledge and experience.
It won't replace understanding how a system works, carrying out measurements or proving that a component has failed.

What it can do is help you get from:
“I've got a fault.”
to:
“This is where I should start looking.”

And when you've got several jobs waiting outside the workshop, saving diagnostic time matters.
AI and THINKCAR Diagnostic ToolsWe're already seeing this technology become part of professional vehicle diagnostics, including on the Thinkcar 399 professional diagnostic tool.

But rather than getting caught up in the term “AI-powered diagnostics”, we'd rather show technicians what the technology can actually do in a workshop.

Take a look at the two THINKCAR demonstrations above and decide for yourself:
Would this help you diagnose a difficult job in your workshop?

Because ultimately, that's the important bit.
​
Find Out More Explore the THINKCAR professional diagnostic range at Thinkcar UK or speak to an authorised Thinkcar UK dealer for more information or a demonstration.
THINKCAR UK — Smarter Diagnostics. Stronger Support.

BMW & MINI FRM Short Circuit Fault Reset with the Thinkcar 399BMW and MINI FRM (Footwell Module) short circuit faults are a common issue that can cause exterior lighting failures, persistent warning lights and fault codes that refuse to clear. Fortunately, if the underlying electrical fault has been repaired, the Thinkcar 399 provides a fast and effective way to reset these faults without replacing the FRM module.
In this guide, we explain how the Thinkcar 399 performs an FRM short circuit reset and highlight the fault codes covered in our latest YouTube tutorial, created in collaboration with RMS Diagnostics.
What Is an FRM Short Circuit Fault?The Footwell Module (FRM) is responsible for controlling many of the vehicle's lighting functions, including headlights, tail lamps, number plate lights, indicators and interior lighting.
When the FRM detects repeated overcurrent or short circuit conditions, it disables the affected output to protect the electrical system. Even after the original wiring or component fault has been repaired, the output often remains disabled until the FRM short circuit counter is reset using a compatible diagnostic tool.
This is where the Thinkcar 399 can save valuable workshop time.
BMW & MINI FRM Fault Codes CoveredOur latest tutorial demonstrates how to reset common FRM short circuit faults, including:

• A8A8
• A8A9
• A8AA
• A8AB
• A8AC
• A8AD
• A8AE
• A8BA – Right Tail Lamp
• A8BD – Number Plate Light
• 9CBB – Short Circuit Fault

These faults are commonly found across a wide range of BMW and MINI models equipped with FRM modules.
How to Reset BMW FRM Short Circuit FaultsUsing the Thinkcar 399, technicians can:

• Access the BMW or MINI Footwell Module (FRM)
• Read stored diagnostic trouble codes (DTCs)
• Reset FRM short circuit counters after repairs have been completed
• Restore disabled lighting outputs where applicable
• Verify that the repair has been completed successfully

It is important to remember that the electrical fault should always be repaired before performing the reset. Resetting the counter without fixing the root cause may result in the fault returning immediately.
Why Use the Thinkcar 399?The Thinkcar 399 is a professional diagnostic tool designed for independent workshops, mobile technicians and automotive specialists.
Key features include:

• Professional-level diagnostics
• Advanced service and maintenance functions
• Manufacturer-specific diagnostic capabilities
• Fast system scanning
• Regular software updates
• Coverage for a wide range of vehicle manufacturers, including BMW and MINI

For technicians working on modern vehicles, the Thinkcar 399 offers an efficient solution for diagnosing and resolving complex electronic faults.
Watch the Full Video TutorialTo see the complete FRM short circuit reset procedure, watch our latest video on the Thinkcar UK YouTube channel. The tutorial provides a step-by-step demonstration using the Thinkcar 399, making it easy to follow the diagnostic process from start to finish.
Created in Partnership with RMS DiagnosticsThis video has been produced in collaboration with RMS Diagnostics, specialists in advanced vehicle diagnostics, fault finding, programming and automotive electronics.
RMS Diagnostics regularly publish technical repair videos and real-world workshop case studies, making their channel an excellent resource for professional technicians looking to expand their diagnostic knowledge.
We recommend subscribing to both the Thinkcar UK YouTube channel and the RMS Diagnostics YouTube channel for the latest diagnostic tutorials, product demonstrations and professional repair advice.
Frequently Asked QuestionsCan the Thinkcar 399 reset BMW FRM short circuit faults?Yes. The Thinkcar 399 supports FRM short circuit counter resets on compatible BMW and MINI vehicles after the underlying fault has been repaired.
What causes FRM short circuit faults?They are typically caused by faulty bulbs, damaged wiring, water ingress, short circuits or failed lighting components. Once the issue has been repaired, the FRM may still require a counter reset before the affected lighting circuit will operate again.
Will resetting the FRM fix the problem?Only if the original electrical fault has already been repaired. The reset restores the FRM output after the cause of the fault has been eliminated.
Learn More with Thinkcar UKThinkcar UK regularly publishes technical articles and video tutorials covering advanced diagnostics, coding, service functions and repair procedures for professional workshops.
Whether you're diagnosing BMW electrical faults, programming new components or carrying out routine servicing, our growing library of resources is designed to help you get the most from your Thinkcar diagnostic equipment.

Which Thinkcar Professional Diagnostic Tool is Best? A Complete Guide to Remote Diagnostics, Online Programming and AI-Powered Vehicle RepairModern vehicle diagnostics have evolved far beyond simply reading and clearing fault codes. Today's professional workshops require intelligent diagnostic platforms that can communicate with increasingly complex vehicle systems, perform online programming, support remote diagnostics, and even use artificial intelligence to help technicians diagnose faults more efficiently.
This is where Thinkcar continues to lead the way.
Whether you're considering the Thinkcar 191, Thinkcar 195, Thinkcar 391, Thinkcar 394, or the flagship Thinkcar 399, every professional Thinkcar diagnostic tool has been developed to help workshops reduce diagnostic time, increase productivity, and confidently repair today's modern vehicles.
In this guide, we'll explore why Thinkcar has become one of the fastest-growing professional diagnostic brands and how its advanced features are transforming the way technicians work.

Professional Diagnostics Built for Modern WorkshopsAs vehicle technology advances, so does the need for more sophisticated diagnostic equipment.
Modern cars contain dozens of electronic control units (ECUs), complex communication networks, ADAS systems, hybrid and electric vehicle technology, and manufacturer-specific programming functions. Traditional code readers simply cannot keep up with these demands.
Thinkcar's professional diagnostic range is designed specifically for independent garages, franchise workshops, fleet operators, and mobile technicians who need dealer-level functionality without the dealer-level cost.
Every professional Thinkcar scanner provides comprehensive system diagnostics, allowing technicians to communicate with every major vehicle module, including:

• Engine Management
• Automatic Transmission
• ABS
• Airbag (SRS)
• Body Control Module
• Electric Parking Brake
• TPMS
• Steering Systems
• HVAC
• Battery Management
• Hybrid Systems
• Electric Vehicle Systems

This allows technicians to identify faults accurately, reduce unnecessary parts replacement, and complete repairs more efficiently.

Choosing the Right Thinkcar ModelThinkcar offers a professional diagnostic solution for workshops of every size.
Whether you're investing in the Thinkcar 191, Thinkcar 195, Thinkcar 391, Thinkcar 394, or the premium Thinkcar 399, every model is built around professional vehicle diagnostics with powerful software and regular updates.
The Thinkcar 191 and Thinkcar 195 provide excellent professional-level diagnostics for independent technicians looking for reliable daily diagnostic performance.
Moving further up the range, the Thinkcar 391 introduces enhanced workshop functionality, while the Thinkcar 394 expands diagnostic capability with additional advanced features designed for high-volume repair environments.
For workshops demanding maximum performance, the Thinkcar 399 delivers Thinkcar's most comprehensive diagnostic experience, combining advanced diagnostics, online functions, intelligent software, and exceptional vehicle coverage.
No matter which model you choose, every Thinkcar professional scanner is designed to save time, improve accuracy, and maximise workshop productivity.

Remote Diagnostics: Expert Help When You Need ItOne of the biggest advantages of modern Thinkcar diagnostic platforms is the ability to support remote diagnostics.
Instead of spending valuable workshop time chasing difficult faults, technicians can utilise remote assistance to access additional expertise when diagnosing complex vehicle issues.
Remote diagnostics allow experienced specialists to assist with advanced fault finding, helping technicians:

• Diagnose difficult intermittent faults
• Interpret live data
• Confirm repair procedures
• Reduce unnecessary component replacement
• Improve first-time fix rates
• Minimise vehicle downtime

For busy workshops, this means faster repairs, happier customers, and improved profitability.

Online Programming for Modern VehiclesVehicle manufacturers now require many replacement components to be programmed online before they function correctly.
Modules including engine control units, body control modules, steering systems, transmissions, batteries, and driver assistance systems often require manufacturer-specific programming after installation.
Thinkcar supports online programming and coding on supported vehicles, allowing professional technicians to carry out procedures that previously required expensive dealer equipment.
Depending on vehicle manufacturer and model, online functions may include:

• ECU Coding
• Module Replacement
• Online Programming
• Configuration Updates
• Adaptations
• Variant Coding
• Personalisation Functions
• Software Synchronisation

As vehicle technology continues to develop, online programming is becoming an essential part of professional vehicle repair.

AI-Powered DiagnosticsArtificial Intelligence is changing the automotive repair industry.
Thinkcar's latest software introduces intelligent diagnostic features that help technicians reach accurate conclusions more quickly by analysing fault information, vehicle symptoms, diagnostic data, and repair pathways.
AI-assisted diagnostics can help technicians by:

• Interpreting fault codes
• Explaining technical terminology
• Suggesting diagnostic procedures
• Identifying possible causes
• Recommending repair sequences
• Improving diagnostic efficiency

Rather than replacing technician experience, AI works alongside professional knowledge, helping workshops reduce diagnostic time and improve repair confidence.
As automotive technology becomes increasingly complex, AI is rapidly becoming an invaluable tool for professional repair businesses.

Bi-Directional ControlProfessional diagnostics isn't just about reading fault codes.
Thinkcar's advanced diagnostic platforms also provide bi-directional control, allowing technicians to command vehicle components directly from the diagnostic tool.
Examples include:

• Operating cooling fans
• Activating fuel pumps
• Testing injectors
• Cycling ABS pumps
• Controlling electronic parking brakes
• Operating window motors
• Activating lighting circuits
• Testing relays
• Running system calibrations

Active testing dramatically speeds up diagnosis by confirming whether components are functioning correctly without dismantling the vehicle.

Comprehensive Service FunctionsThinkcar professional tools also include an extensive range of maintenance functions designed for daily workshop use.
These include:

• Oil Service Reset
• EPB Reset
• Steering Angle Sensor Calibration
• Battery Registration
• Injector Coding
• DPF Regeneration
• Throttle Adaptation
• TPMS Service
• ABS Bleeding
• Suspension Calibration
• Gearbox Adaptation
• Air Conditioning Reset
• Immobiliser Functions (supported vehicles)

Having these functions available on one professional platform allows workshops to complete more work in-house while reducing reliance on multiple specialist tools.

Regular Software UpdatesThe automotive industry changes rapidly, with new vehicle models and software versions being introduced every year.
Thinkcar continuously develops its diagnostic software, providing regular updates that improve vehicle coverage, add new functions, expand manufacturer support, and introduce the latest diagnostic technology.
This ensures your investment continues to deliver value long after purchase.

Why Professional Workshops Choose Thinkcar UKWhen purchasing professional diagnostic equipment, choosing the right supplier is just as important as choosing the right product.
At Thinkcar UK, we supply genuine professional diagnostic equipment backed by UK-based technical support, software expertise, and after-sales service.
Our customers benefit from:

• Genuine Thinkcar professional products
• UK technical support
• Professional product advice
• Regular software updates
• Warranty support
• Training and after-sales assistance
• Expert guidance on selecting the right diagnostic solution

Whether you're a one-person mobile technician or a multi-bay workshop, our team can help you find the right Thinkcar solution for your business.

The Future of Vehicle DiagnosticsThe future of vehicle repair is intelligent, connected, and increasingly cloud-based.
Remote diagnostics, online programming, AI-powered assistance, wireless communication, and cloud-based software updates are no longer optional extras—they are becoming essential tools for modern workshops.
Thinkcar continues to invest in these technologies, ensuring professional technicians have access to advanced diagnostic capabilities that keep pace with the latest vehicle technology.
Whether you choose the Thinkcar 191, 195, 391, 394, or the flagship 399, you're investing in a professional diagnostic platform designed for the future of automotive repair.
With dealer-level diagnostics, intelligent software, remote support, online programming, AI-assisted fault finding, and comprehensive vehicle coverage, Thinkcar provides everything today's professional technician needs to diagnose smarter, repair faster, and keep customers on the road.
If you're looking for a professional diagnostic tool that combines innovation, reliability, and exceptional value, explore the Thinkcar professional range today and discover why more workshops across the UK are making the switch to Thinkcar.