The right diagnostic tool and the right software for Mercedes – Guide 2025
Mercedes-Benz has stood for quality, innovation, and luxury for decades. However, as vehicles become increasingly technically complex, so too do the demands on maintenance and diagnostics. Modern Mercedes models are equipped with dozens of control units that communicate with each other and store error codes. Reliably reading these systems requires the right software and the right diagnostic tool .
In this article, we answer the most important questions about Mercedes diagnostics – from software and official workshop equipment to solutions for private customers and useful apps.
Which diagnostic software is right for Mercedes-Benz?
Mercedes has relied on its proprietary software solution, Xentry/DAS , for many years. This system is used in all authorized Mercedes-Benz workshops and is considered the standard diagnostic solution.
- Xentry is the modern platform that covers all current models. It offers guided troubleshooting , live data, service functions, and coding capabilities.
- DAS (Diagnostic Assistance System) is the predecessor software and is required for older models that are not yet fully supported by Xentry.
With Xentry/DAS, workshops can:
- read the complete error memory,
- start guided repair processes,
- Program or update control units,
- and also perform model-specific special functions, such as SBC brake service or transmission oil change instructions.
However, Xentry is often too complex and expensive for private customers . Multi-brand solutions such as the Vident devices (iLink400, iAuto701) offer a good alternative. These aren't as comprehensive as Xentry, but they cover the most important functions such as error code reading, service reset, and brake service.
- For workshops: Xentry/DAS is mandatory.
- For private customers: Vident software via iLink400 or iAuto701 is completely sufficient.
Which diagnostic tool is suitable for Mercedes vehicles?
The choice of the right diagnostic tool depends largely on who uses it. Mercedes drivers fall into three main groups:
1. Private customers and beginners
If you only want to read the error log or reset the check engine light occasionally, a compact device like the Vident iLink400 is perfect.
- It is cheap ,
- easy to use,
- and supports brand-specific Mercedes vehicles.
In addition to engine control units, the device can also address ABS, airbags and other systems – a decisive advantage over very simple OBD2 adapters.
2. Ambitious hobby mechanics
Anyone who regularly works on their Mercedes should consider the Vident iAuto701 . This device offers additional service functions , such as:
- Resetting oil and service intervals,
- open/close electronic parking brake,
- Initiate DPF regeneration,
- Learn how to change the battery.
It also supports multiple brands – ideal if a household has not only Mercedes but also other vehicles.
3. Professionals and workshops
For workshops and semi-professionals, a Vident device is often insufficient. In these cases, the Mercedes-Benz Star Diagnosis (SD Connect C4 or C5 with Xentry/DAS) is the benchmark.
- It provides access to all control units ,
- carries out manufacturer-tested repair procedures ,
- enables coding and software updates .
A typical example: If a new control unit needs to be programmed in a Mercedes-Benz E-Class (W212), this is only possible with Star Diagnosis .
Which diagnostic devices does Mercedes itself use?
Mercedes-Benz only uses the official Star Diagnosis systems in combination with the Xentry/DAS software .
This means specifically:
- Hardware: SD Connect C4 or C5 multiplexer.
- Software: Xentry (for new models) and DAS (for older models).
- Area of application: From cars to vans (Sprinter) to trucks (Actros).
In practice, it looks like this: When you take your Mercedes to an authorized workshop, the mechanic will work with exactly this system. It is therefore the reference system against which all other devices are measured.
Of course, this system is very powerful, but also expensive and unnecessarily complex for private users.
Which diagnostic tool is particularly recommended for Mercedes?
"Highly recommended" means it has to fit your application profile . The most expensive device isn't automatically the best choice if you only use it rarely.
- For occasional users : The Vident iLink400 is ideal if you only want to check error codes and keep track of minor maintenance.
- For frequent users and hobbyists : The Vident iAuto701 offers significantly more features and is also compatible with other brands. This means you're well-equipped for a variety of scenarios.
- For professionals : The Star Diagnostic System (SD Connect C4/C5 with Xentry) is unbeatable in depth and functionality. It allows you to edit all control units, perform programming, and even update software versions.
Practical tip: If you're unsure, start with a Vident device . If you want more later, you can always invest in a professional solution.
Is there a suitable diagnostic app for Mercedes?
Many drivers wonder if there's a smartphone app for reading error codes. In fact, there are several options:
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Mercedes Me (officially from Mercedes-Benz)
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This app is more intended for convenience and vehicle management.
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You can use it to retrieve vehicle information, view the service schedule, or check the vehicle's location.
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However, it is unsuitable for the actual diagnosis.
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General OBD apps (e.g. Car Scanner, Torque Pro)
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Works with inexpensive OBD2 adapters via Bluetooth.
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Usually only show engine and emission-related data.
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No access to ABS, airbag or comfort systems.
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Brand-specific apps are currently not available for Mercedes to the same extent as the Vident devices or Star Diagnosis.
An app is a nice addition if you just want to monitor engine parameters . However, for a true diagnosis on a Mercedes, a proper device is essential.
Buying a diagnostic device for Mercedes – what to look out for?
If you're looking to purchase a Mercedes diagnostic tool , you should primarily consider its range of functions. For beginners, a compact device like the Vident iLink400, which already addresses the most important control units and clears error codes, is sufficient. Ambitious users are better off opting for the Vident iAuto701, as it offers additional service functions and can also be used for other vehicle brands. Workshops, on the other hand, require the original Star Diagnosis System with Xentry/DAS to be able to program and code all control units. Therefore, the decisive factor is how deeply you want to delve into the technology of your Mercedes.
Find the right Mercedes diagnostic device
Choosing the right diagnostic tool for Mercedes depends on how deeply you want to delve into vehicle technology:
- Private customers : Vident iLink400 – compact and simple, ideal for beginners.
- Ambitious users : Vident iAuto701 – more extensive service functions, multi-compatible.
- Professionals/Workshops : Mercedes-Benz Star Diagnosis (SD Connect C4/C5 with Xentry/DAS).
- Apps : useful for basic values, but no substitute for real diagnostic devices.
This means you are perfectly equipped, whether you just want to clear error codes from time to time or you need the full range of functions as a workshop.