Start the Car With a Dead Key Fob Battery

Last updated: June 10, 2026

The Škoda Scala (2019–Present) is Škoda’s family hatchback on the MQB-A0 platform, replacing the Rapid and sitting alongside the Kamiq. Higher trims commonly have KESSY keyless entry, so a dead fob battery leaves the doors and the START/STOP button unresponsive. That does not mean the car is dead: the immobiliser can still read the chip inside the fob when you hold it to the start button, and the emergency blade hidden in the fob unlocks the door.

The Scala has run as a single generation since launch. The procedure below applies to the whole range; entry-spec cars without KESSY use a turn-key ignition instead of the button.

Start the Scala With a Dead Fob

KESSY (button-start) Scala:

1. Get in with the emergency blade first (next section) — a flat fob will not work the door buttons.
2. Press and hold the brake pedal.
3. Hold the fob flat against the START/STOP button so the transponder sits over the reader behind it.
4. Press the button through the fob. The immobiliser powers the chip by induction, confirms the key, and starts the engine.
5. If nothing happens, reposition the fob a few millimetres and press again — the read zone is small.

Turn-key Scala:

1. Open the driver’s door with the emergency blade.
2. Insert the blade into the ignition barrel and turn to start — a flat fob does not affect a blade-ignition start.

Unlock the Scala With the Emergency Key Blade

1. Slide the catch on the fob and pull out the metal emergency blade.
2. The lock barrel hides behind a plastic cap on the driver’s door handle. Lever the cap off using the slot at its rear edge.
3. Insert the blade and turn to unlock. Manual entry can trip the alarm; pressing START with the fob inside the cabin clears it.
4. Continue with the contact-start method (KESSY) or the ignition barrel (turn-key).

Why the Immobiliser Still Trusts the Key

The Scala’s fob carries a passive immobiliser transponder powered wirelessly by the car’s reader coil — the coin cell is not part of authenticating the key. The battery only runs the long-range radio for remote locking and keyless approach. Press the fob to the START button and the short-range coil energises the chip directly, so the immobiliser recognises it and releases the engine. That is why even a battery-free valet blade key would start the car.

Replace the Key Fob Battery

1. Remove the emergency blade to free the case.
2. Split the fob halves with a plastic pry tool along the seam.
3. Lift out the old cell — the Scala fob uses a CR2032 3V coin cell.
4. Fit the new battery + side facing the same way as the old one, handling it by the edges.
5. Click the case shut, refit the blade, and test the buttons. A fresh cell lasts roughly 2–3 years.

Frequently Asked Questions

Does my Scala have keyless start? Many do, especially mid and high trims with KESSY. A START/STOP button rather than a twist key means you have it.

Where is the emergency reader on the Scala? Behind the START/STOP button. Hold the flat back of the fob directly against it.

How do I unlock the Scala with a dead fob? Use the emergency blade in the hidden driver’s-door lock, under the clip-off cap on the handle.

What battery does the Scala fob take? A single CR2032 coin cell.

The alarm sounded when I unlocked with the blade — is that a fault? No. Opening manually arms the alarm; authenticating the key by pressing START inside the car turns it off.

If a dashboard warning light is still showing once you are running, decode it on our sister site autodtcs.com.