The Mercedes SD Connect C4 is one of the most widely recognised diagnostic interfaces for Mercedes-Benz vehicle diagnostics. Designed to communicate between a compatible Windows laptop running Mercedes Xentry Diagnostic Software and the vehicle, it provides reliable communication with supported control units for fault diagnosis, live data, servicing and advanced workshop functions.
At OBD Store, we supply professionally tested Mercedes SD Connect C4 diagnostic interfaces for independent workshops, mobile mechanics and Mercedes specialists. Every unit is checked before dispatch to help ensure reliable communication with compatible Mercedes-Benz vehicles.
What Is the Mercedes SD Connect C4?
The C4 Multiplexer is a vehicle communication interface (VCI), sometimes referred to as a multiplexer. It acts as the link between your diagnostic laptop and the vehicle, allowing Mercedes Xentry Diagnostic Software to communicate with the electronic control units installed throughout the vehicle.
Unlike a standard OBD reader, the SD Connect C4 is designed for professional diagnostic work and supports a far wider range of diagnostic functions when used with compatible Mercedes diagnostic software.
Typical systems that can be diagnosed include:
- Engine Management
- Automatic Transmission
- ABS
- ESP
- Airbag (SRS)
- Air Conditioning
- Instrument Cluster
- Body Control Modules
- Parking Assistance
- Lighting Systems
- Steering Systems
What Can the Mercedes SD Connect C4 Do?
When connected to compatible Mercedes Xentry Diagnostic Software, the SD Connect C4 allows technicians to perform professional diagnostic procedures including:
- Reading fault codes
- Clearing fault codes
- Viewing live sensor data
- Running actuator tests
- Carrying out guided diagnostics
- Resetting service indicators
- Accessing multiple control units
- Vehicle health checks
- Adaptation procedures where supported
The available functions depend on the software version and the specific Mercedes-Benz vehicle.
Compatible Mercedes-Benz Vehicles
The Mercedes SD Connect C4 supports a wide range of compatible Mercedes-Benz passenger cars, vans and light commercial vehicles when used with the appropriate version of Mercedes Xentry Diagnostic Software.
Vehicle coverage depends on:
- Model
- Model year
- Software version
- Diagnostic interface configuration
If you are unsure whether your vehicle is supported, contact OBD Store before ordering.
Why Choose the SD Connect C4?
The SD Connect C4 remains a popular choice because it provides stable communication with supported Mercedes-Benz vehicles and integrates seamlessly with Mercedes Xentry Diagnostic Software.
Benefits include:
- Reliable vehicle communication
- Fast fault diagnosis
- Stable workshop performance
- Professional workshop functionality
- Compatible with supported Mercedes diagnostic systems
- Suitable for independent workshops and specialists
SD Connect C4 Features
| Feature | Included |
|---|---|
| Mercedes vehicle communication | ✔ |
| Fault code reading | ✔ |
| Live data | ✔ |
| Actuator testing | ✔ |
| Guided diagnostics | ✔ |
| Multiple ECU communication | ✔ |
| Compatible with Xentry | ✔ |
| Workshop ready | ✔ |
SD Connect C4 vs Standard OBD Scanners
Many low-cost OBD scanners can only access engine fault codes and basic emissions information.
The Mercedes-Benz Diagnostic Interface is designed for professional diagnostics and communicates with multiple vehicle control units, allowing technicians to perform far more detailed diagnostic procedures.
For workshops carrying out regular Mercedes-Benz repairs, the SD Connect C4 provides significantly greater diagnostic capability than a basic code reader.
Can I Use SD Connect C4 With My Own Laptop?
Yes.
If you already own a suitable Windows laptop, OBD Store can install compatible Mercedes diagnostic software.
However, if your laptop later develops hardware faults or requires Windows to be reinstalled, the software installation will be lost and a replacement installation may be required.
Many customers therefore choose to purchase a complete Mercedes diagnostic laptop together with the SD Connect C4 interface, ensuring the entire system is tested and supported as one complete package.
Why Buy from OBD Store?
Every Mercedes SD Connect C4 supplied by OBD Store is professionally checked before dispatch.
Benefits include:
- Professionally tested hardware
- UK technical support
- Remote assistance where applicable
- Fast dispatch
- Complete Mercedes diagnostic solutions
- Reliable after-sales support
Our aim is to supply dependable diagnostic equipment that works from day one.
Frequently Asked Questions
What is the Mercedes C4 Multiplexer?
The Mercedes SD Connect C4 is a professional Mercedes-Benz diagnostic interface that allows compatible diagnostic software to communicate with supported vehicles.
Does SD Connect C4 work with Xentry?
Yes. The SD Connect C4 is designed to operate with compatible versions of Mercedes Xentry Diagnostic Software.
Can I read and clear fault codes?
Yes. Fault code reading and clearing are supported on compatible vehicles.
Does it support live data?
Yes. Live sensor values can be viewed in real time on supported Mercedes-Benz vehicles.
Can I use my own laptop?
Yes. A suitable Windows laptop can be used, or you can purchase a complete pre-configured system from OBD Store.
Related Products
External References
For information about Mercedes-Benz workshop diagnostics, refer to the official Mercedes-Benz XENTRY Shop and Mercedes-Benz Workshop Solutions websites.
Order Mercedes C4 Multiplexer
Whether you require the SD Connect C4 interface on its own or as part of a complete Mercedes diagnostic laptop package, OBD Store can supply a professionally tested solution suitable for independent workshops and Mercedes specialists.
Our team can also advise on compatibility, software options and the most suitable diagnostic package for your workshop.
