Choosing the right scan tool can feel confusing, especially with so many models, brands, and features available. The best place to start is not with the tool itself, but with what you want it to do.
Some people only need to read and clear engine fault codes. Others need access to ABS, airbags, transmission, service resets, battery registration, DPF functions, or deeper diagnostics across multiple vehicle systems.
This guide will help point you in the right direction.
Start With What You Want the Tool to Do
Before choosing a scan tool, ask yourself one simple question:
Do I only want basic engine fault code reading, or do I need deeper access to the vehicle?
If you only want to check why the engine light is on, a basic OBD2 scanner may be enough.
If you want to work with service functions, reset maintenance lights, diagnose ABS or airbag faults, view live data from different modules, or work on more than one vehicle, you will likely need a more capable scan tool.
I Just Want to Read and Clear Engine Codes
If your main goal is to check engine fault codes, clear a check engine light, and view basic live data, a basic OBD2 scanner is usually the best place to start.
These tools are simple, affordable, and useful for everyday drivers who want a quick way to check common engine-related faults.
A basic OBD2 scanner is generally suited for:
- Reading and clearing engine fault codes
- Checking why the engine light is on
- Viewing basic live data
- Checking emissions-related faults
- Basic DIY fault finding
However, basic OBD2 scanners usually do not access systems such as ABS, airbags, transmission, body control, electronic parking brake, or service reset functions.
If you need those features, you will want to look at a more advanced scan tool.
Best category: Basic OBD2 Scanners
I Want Service Resets and Deeper Diagnostics
If you want more than basic engine fault codes, you should look at a full-system diagnostic scan tool.
These tools can access more vehicle systems, depending on the make, model, year, and system fitted to the vehicle. This may include engine, transmission, ABS, airbags, steering, body control, electronic parking brake, battery management, and other modules.
A full-system scan tool is generally suited for:
- Reading and clearing fault codes from multiple systems
- Diagnosing ABS, airbag, transmission, and body system faults
- Viewing live data from supported modules
- Resetting service lights
- Battery registration or battery management functions
- Electronic parking brake service
- DPF functions
- Steering angle sensor calibration
- Injector coding or relearn functions on supported vehicles
These tools are a better option for home mechanics, enthusiasts, small workshops, and anyone who wants a more complete view of what is happening inside the vehicle.
Best categories: Single Make Scan Tools or All Makes Scan Tools
I Mainly Work on One Vehicle Make
If you mainly work on one brand of vehicle, a single-make scan tool can be a very good option.
These tools are designed around a specific vehicle group, such as BMW, Mercedes-Benz, Volkswagen/Audi, Toyota, Ford, Land Rover, Porsche, Volvo, and others.
A single-make scan tool often gives strong value because it focuses on the systems and functions used by that manufacturer group, rather than trying to cover everything.
This type of tool is usually best if:
- You own one main vehicle
- Your household has vehicles from the same manufacturer group
- You want deeper access for one brand
- You want service reset and maintenance functions for a specific make
- You do not need to work across lots of different vehicle brands
Best category: Single Make Scan Tools
I Work on Multiple Vehicle Makes
If you work on several different vehicles, an all-makes scan tool is usually the better choice.
These tools are designed to cover a wide range of vehicle manufacturers, making them ideal for households with multiple cars, small workshops, mobile mechanics, fleet users, or anyone who regularly works on different makes and models.
An all-makes scan tool is usually best if:
- You want one tool for multiple vehicles
- You work on different makes and models
- You help family or friends with their vehicles
- You run a small workshop or side business
- You want broad system coverage and service functions
All-makes tools vary in capability, so it is worth comparing the models carefully. Some are handheld tools with straightforward menus, while others are larger touchscreen or tablet-style tools with more advanced features.
Best category: All Makes Scan Tools
Basic OBD2 vs Full-System Diagnostics
This is one of the most important differences to understand.
A basic OBD2 scanner is mainly for engine and emissions-related diagnostics. It can usually read and clear engine fault codes and show basic live data.
A full-system scan tool can go further. It may access systems such as ABS, airbags, transmission, body control, steering, electronic parking brake, battery management, and service reset functions, depending on vehicle support.
In simple terms:
Choose a basic OBD2 scanner if:
You mainly want to check engine lights and basic fault codes.
Choose a full-system scan tool if:
You want deeper diagnostics, service resets, and access to more vehicle systems.
Other Tool Types
Some jobs need a more specialised tool.
Stahlcar also offers tools and accessories for battery testing, scan gauges, tyre pressure systems, throttle controllers, cables, adapters, and motorcycle diagnostics.
These are not always direct replacements for a diagnostic scan tool. In many cases, they are designed for a specific job or vehicle type.
If you are unsure whether you need a scan tool, an adapter, a battery tester, or another type of tool, it is best to check before ordering.
A Quick Note About OBD2 Compatibility
OBD2 is still important, but it is not the only thing to consider when choosing a scan tool.
For basic OBD2 scanners, vehicle OBD2 compatibility matters because these tools rely on standard engine and emissions protocols.
For more advanced scan tools, coverage is usually based on the vehicle make, model, year, and the systems supported by the tool. This is why one scan tool may offer basic engine access on one vehicle but deeper system access and service functions on another.
As a general guide, most petrol vehicles from the mid-2000s onward and diesel vehicles from the late-2000s onward are likely to support standard OBD2 engine diagnostics, but there are exceptions, especially with imports and older vehicles.
If your vehicle is older, imported, or you need a specific function, it is worth checking compatibility first.
Still Not Sure?
If you are not sure which scan tool is right for your vehicle, get in touch before ordering.
Send us your vehicle make, model, year, engine type, and what you want the tool to do. We can help point you toward the most suitable option.
The right tool depends on the vehicle, the systems you need to access, and the type of work you want to carry out. A basic scanner may be enough for simple engine fault codes, but a full-system scan tool is the better choice if you want deeper diagnostics and service functions.