EZS Test Tool
Professional Mercedes-Benz EZS diagnostics over standard OBD — read-only, non-invasive, FBS3 & FBS4.
Get started with EZS Test Tool
Download the software for free and start running professional Mercedes-Benz EZS diagnostics over your existing J2534 PassThru adapter.
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 — 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 — prove an EZS fault with data instead of guessing.
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.
All functions included
Every function below is included for free — no license, no subscriptions.
VIN Reading
Part Number Reading
SSID Reading
Hardware & Software Version
Lock State Reading
Key-Plug Status
Fault Codes Reading
FBS Live Monitor
Test ELV
Do you have some questions? Message us on WhatsApp.
