EZS Test Tool — License & Download
EZS Test Tool
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Software & License
Get Started with EZS Test Tool
EZS Test Tool requires a one-time license (€199). Purchase your license, download the software, and start running professional Mercedes-Benz EZS diagnostics over your existing J2534 PassThru adapter.
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Professional EZS Diagnostics — No Bench Work Needed
Deep EZS Testing Over Standard OBD-II
This is not a key programming tool. EZS Test Tool is a dedicated diagnostic platform for the Mercedes-Benz electronic ignition switch (Elektronisches Zündschloss) — the immobilizer ECU at the heart of every FBS3 and FBS4 vehicle.
It runs non-invasive, read-only diagnostics on the EZS module: full identification reads, lock-state checks, ELV testing, key-plug status, and real-time FBS bus monitoring — all without removing the part from the vehicle.
Built for Mercedes-Benz specialists who want to test before they diagnose — instead of guessing whether an EZS is the fault, prove it with data.
Read-Only & Non-Invasive
No writes, no programming, no calibration changes. Pure diagnostics — safe on every car.
FBS3 & FBS4 Coverage
Works across both immobilizer generations — from W204/W212 era through W167/W206/W223.
J2534 PassThru Compatible
Works with any standard J2534 adapter — no proprietary hardware required.
EZS Test Functions
All Functions Included
Every function below is included with your €199 license — no extras, no subscriptions
Mercedes-Benz EZS
FBS3 Supported
FBS4 Supported
VIN Reading
Part Number Reading
SSID Reading
Hardware & Software Version
Lock State Reading
Key-Plug Status
Fault Codes Reading
FBS Live Monitor
Test ELV
Watch How It Works
EZS Test Tool Walkthrough
Complete walkthrough of installation, connection, and the full EZS diagnostic workflow