Mercedes-Benz Steering Lock and Ignition Repair

A failed electronic steering lock or ignition switch can leave your Mercedes-Benz unable to start, even when the key turns in the ignition. You may also find that the dashboard stays dark or the steering wheel remains locked.

Our repair service rebuilds your electronic steering lock and repairs a common fault in the ignition switch, including preventative attention to that fault even if the switch is still operating. Repairing these components together provides a practical alternative to replacing the matched units.

EIS, EZS, ESL and ELV explained

• EIS / EZS: the electronic ignition switch, also called the electronic ignition lock.
• ESL / ELV: the electronic steering lock.

These components work together as part of the vehicle's start-authorisation system. A fault in either can prevent the vehicle from recognising the correct conditions to start.

Common symptoms

• The vehicle will not start or the engine will not crank.
• No dashboard lights when turning the key.
• The key turns, but the vehicle does not respond.
• The steering wheel remains locked.
• The usual steering-lock release sound is absent when inserting the key.

Associated fault codes

• A25407: electronic steering lock mechanical fault.
• A25408: electronic steering lock signal or message fault.
• A25409: electronic steering lock component fault.
• A25464: electronic steering lock implausible signal.
• A22449: electronic ignition lock internal electrical fault.

Compatible vehicles

• Mercedes-Benz C-Class W204.
• Mercedes-Benz E-Class W212 Sedan.
• Mercedes-Benz E-Class C207 Coupe.
• Mercedes-Benz E-Class A207 Cabriolet.
• Mercedes-Benz GLK X204.
• Mercedes-Benz SLK R172.

Fitment note: Coverage depends on the fitted ignition and steering-lock units. Include your VIN, fault symptoms and any diagnostic codes in the repair form so the repair can be matched to your vehicle.

Common part numbers

Reference numbers listed for this service include:

• A2045450632
• A2045455732
• A2045458132
• A2049005912
• A2045450908
• A2045451308
• A2045451508
• A2075450108
• A2079057101
• A2129055800
• A2129055000
• A2129055200

How to book your repair

1. Order online: add the repair service to your cart and complete checkout.
2. Submit your details: complete the repair form with your order number, vehicle details and fault description.
3. Send the matched components: securely package the ignition switch, steering lock and at least one working key together. Follow the delivery instructions on the repair page and include your order details.
4. Refit after repair: the repaired components are returned ready for installation in the original vehicle, without additional vehicle coding.

What to send

• The electronic ignition switch — EIS / EZS.
• The electronic steering lock — ESL / ELV.
• At least one working key belonging to the vehicle.

All three are required for this repair. If the vehicle currently will not start, send the key normally used with that ignition switch and describe the symptoms in the form.

What the service includes

• A full rebuild of your supplied electronic steering lock.
• Repair of the common ignition-switch fault described above, even if it has not yet caused a failure.
• Preparation of the repaired components for refitting to the original vehicle without additional coding.
• A 12-month unlimited-kilometre repair warranty.

This listing is for repair of your supplied components, rather than the purchase of replacement units.

Frequently asked questions