Are you experiencing starting issues or dashboard errors in your Mercedes W447 Vito or Viano? If your vehicle shows the fault code:
B17F F00 – Steering Column Lock Actuation Signal Improbable,
…it’s likely your Electronic Ignition Switch (EIS) or Steering Lock (ESL) has failed — a common issue in Mercedes FBS4 systems.
At 247 Auto Locksmith, we offer a professional postal repair service to resolve this fault quickly and cost-effectively, with prices starting from £249.
Commonly Affected Vehicles
- Mercedes-Benz Vito W447
- Mercedes-Benz Viano
What Is the FBS4 EIS System?
FBS4 is Mercedes-Benz’s latest anti-theft system, and it has been used in newer models from around 2015 onwards. It includes advanced synchronisation between the EIS (Electronic Ignition Switch), ESL (Electronic Steering Lock), ECU, and vehicle keys.
Unlike older FBS3 systems, FBS4 modules are cryptographically linked to the vehicle, which makes diagnosis and repair more complex and expensive when using dealer services.
Common Symptoms of FBS4 EIS / ESL Faults
- Key turns but no ignition or crank
- No dash lights or response
- The steering lock doesn’t engage or disengage
- Diagnostic trouble code: B17F F00
- Occasional “Start Error” message
Part Numbers We Commonly Repair
We support a wide range of W447 FBS4 EIS units, including but not limited to:
- A4479004805
- A4479007606
- A4479001111
- A4479004505
- A4479000911
- A4479002805
- A4479007306
- A4479002505
- A4479007313
If your part number is not listed, please get in touch with us to confirm compatibility.
How Our Postal EIS Repair Service Works
- Remove the faulty EIS module from your vehicle.
- Send the EIS along with all existing keys and your vehicle’s VIN via a tracked postal service.
- We will diagnose and repair the unit, typically within 1 to 3 business days.
- We return it to you, fully working and ready to plug back in — no further coding required.
Why Choose 247 Auto Locksmith?
- Prices start from £249
- Full FBS4 diagnostic and repair capability
- Fast turnaround – 1 to 3 working days
- Postal service available UK-wide
- 6-month parts and labour warranty
- Trusted, experienced auto locksmith professionals
Contact Us
To book your FBS4 EIS repair or to ask a question, get in touch:
Phone: 07921 365 247
Website: www.247autolocksmith.co.uk
WhatsApp: Available on the same number