Terminator Mercedes-Benz FBS4 Key Solution Selection Guide

Mercedes-Benz FBS4 Key Solution Selection Guide
How to Choose the Correct FBS4 Solution?
Mercedes-Benz FBS4 key solutions are divided according to:

✅ Original key type
✅ Vehicle production year
✅ Push Start function
✅ Keyless-Go door handle function

Before ordering, please check your original key and vehicle configuration carefully.

Type 1: Old-Style Smart Key (2012-2018)
Key Identification
Suitable for older generation Mercedes-Benz FBS4 systems.

Main features:

Old-style Mercedes Smart Key
Commonly used on 2012-2018 models
Key Image:


FBS4 801
Mercedes-Benz FBS4 Keyless-Go Start Solution
Vehicle Requirements:
✅ Old-style Smart Key
✅ Original Push Start function
❌ No Keyless-Go door handle touch function

Product Features:
Supports original key without disassembly
Supports emergency start function
Simple installation
Designed for professional automotive locksmiths
Purchase Link:
FBS4 801 Keyless-Go Start Solution → [Link]

FBS4 901
Mercedes-Benz FBS4 Keyless-Go Touch Handle Solution
Vehicle Requirements:
✅ Old-style Smart Key
✅ Original Push Start function
✅ Keyless-Go door handle touch function

Product Features:
Supports original Keyless-Go door handle function
Supports original key without disassembly
Supports emergency start function
Purchase Link:
FBS4 901 Keyless-Go Touch Handle Solution → [Link]

Type 2: Flat Smart Key (1 Screw)
Key Identification
Suitable for mid-generation Mercedes-Benz FBS4 systems.

How to identify:

Open the rear cover of the key:

✅ 1 screw inside the key cover

Common vehicle range:

2015-2023 Mercedes-Benz FBS4 models

Key Image:


FBS4 802
Mercedes-Benz FBS4 Flat Smart Key Start Solution
Vehicle Requirements:
✅ Flat Smart Key
✅ Original Push Start function
❌ No Keyless-Go door handle touch function

Product Features:
Supports original key without disassembly
Supports emergency start function
Keeps original vehicle functions
Purchase Link:
FBS4 802 Keyless-Go Start Solution → [Link]

FBS4 902
Mercedes-Benz FBS4 Flat Smart Key Keyless-Go Touch Handle Solution
Vehicle Requirements:
✅ Flat Smart Key
✅ Original Push Start function
✅ Keyless-Go door handle touch function

Product Features:
Supports original Keyless-Go door handle function
Supports original key without disassembly
Supports emergency start function
Purchase Link:
FBS4 902 Keyless-Go Touch Handle Solution → [Link]

Type 3: New Generation Flat Smart Key (3 Screws)
Key Identification
Suitable for new generation Mercedes-Benz FBS4 systems.

How to identify:

Open the rear cover of the key:

✅ 3 screws inside the key cover

Common vehicle range:

2019+ Mercedes-Benz models

Including:

A-Class
B-Class
GLA
GLB
GLE
GLS
MBUX large screen models
Key Image:


FBS4 803
Mercedes-Benz FBS4 New Generation Keyless-Go Start Solution
Vehicle Requirements:
✅ 3-screw Flat Smart Key
✅ Original Push Start function
❌ No Keyless-Go door handle touch function

Product Features:
Supports new generation FBS4 system
Supports original key without disassembly
Supports emergency start function
Purchase Link:
FBS4 803 New Generation Keyless-Go Solution → [Link]

FBS4 903
Mercedes-Benz FBS4 New Generation Keyless-Go Touch Handle Solution
Vehicle Requirements:
✅ 3-screw Flat Smart Key
✅ Original Push Start function
✅ Keyless-Go door handle touch function

Product Features:
Supports new generation FBS4 system
Supports original Keyless-Go door handle function
Supports original key without disassembly
Supports emergency start function
Purchase Link:
FBS4 903 New Generation Keyless-Go Touch Handle Solution → [Link]

Mercedes-Benz FBS4 Quick Comparison
Model    Key Type    Key Identification    Vehicle Year    Push Start    Door Handle Touch
FBS4 801    Old Smart Key    Old-style key    2012-2018    ✅    ❌
FBS4 901    Old Smart Key    Old-style key    2012-2018    ✅    ✅
FBS4 802    Flat Smart Key    1 screw    2015-2023    ✅    ❌
FBS4 902    Flat Smart Key    1 screw    2015-2023    ✅    ✅
FBS4 803    New Flat Smart Key    3 screws    2019+    ✅    ❌
FBS4 903    New Flat Smart Key    3 screws    2019+    ✅    ✅
Not Sure Which Solution You Need?
Please send us:

Mercedes-Benz model
Vehicle year
VIN / chassis number
Original key front and back photos
Door handle touch function information
Our technical team will confirm the correct FBS4 solution for your vehicle.

Mercedes-Benz FBS4 Solutions
All solutions:

FBS4 903 New Generation Keyless-Go Touch Handle Solution → [Link]

FBS4 801 Keyless-Go Start Solution → [Link]

FBS4 901 Keyless-Go Touch Handle Solution → [Link]

FBS4 802 Keyless-Go Start Solution → [Link]

FBS4 902 Keyless-Go Touch Handle Solution → [Link]

FBS4 803 New Generation Keyless-Go Solution → [Link]
















2 Comments

Johan
JULY 19, 2026 / 3:06 PM
REPLY
Hi. It is confusing that you list so many versions that cover the same car class. So if a locksmith wants to cover all the models you have to buy 7 x $210. And model 902 is listed two times with different text. And what do Mercedes Bens say regarding the warranty if a car has been key added with this tool?
This site seems and looks not to be trustworthy and unprofessionally made. Any coments?


vnpro5678@gmail.com
JULY 20, 2026 / 10:35 AM
REPLY
Hello, thank you very much for your detailed feedback.
We really appreciate your suggestions. Your comments are very important for us to improve our website and product information.

You are right — the previous product descriptions were not clear enough, and the different FBS4 versions could easily confuse customers.

The reason we have different versions is not because they are the same product. Mercedes-Benz FBS4 systems are divided according to:

Original key type
Key generation
Vehicle year
Whether the vehicle has Keyless-Go door handle touch function

For example:

FBS4 801 / 901
→ Old-style Smart Key (approximately 2012-2018)
→ Difference: 801 does not support door handle touch, 901 supports door handle touch

FBS4 802 / 902
→ Flat Smart Key (approximately 2015-2023)
→ Difference: 802 does not support door handle touch, 902 supports door handle touch

FBS4 803 / 903
→ New generation flat Smart Key (2019+)
→ Difference: 803 does not support door handle touch, 903 supports door handle touch

We are currently redesigning the product page with a clear selection guide:
Key photo → Key type → Door handle function → Correct model → Purchase link

This will help locksmiths choose the correct solution without purchasing unnecessary versions.

Regarding Mercedes-Benz warranty:

Our product is designed for professional automotive locksmiths and uses the original vehicle communication protocol. The installation does not require modifying the original key circuit.

However, Mercedes-Benz warranty policies may vary by country, dealer, and vehicle condition. Any aftermarket equipment installation should always follow local regulations and professional installation standards.

For professional locksmith use, we recommend checking the vehicle owner’s warranty terms or consulting the local Mercedes-Benz dealer if warranty status is a concern.

We also appreciate your comment about the website. We are continuously improving our website to provide clearer technical information, installation guidance, and better customer support.

Thank you again for your honest feedback. It helps us make our service better for professional locksmiths worldwide.

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