Start the Car With a Dead Key Fob Battery

Last updated: June 10, 2026

The Škoda Karoq (2017–Present) is Škoda’s compact family SUV on the MQB-A1 platform, and like its larger Kodiaq sibling it commonly ships with KESSY keyless entry. When the fob battery dies the remote locking stops working and the car will not register the key for keyless start — but you are not stranded. The immobiliser can still read the chip inside the fob when you hold it to the START/STOP button, and the emergency blade hidden in the fob unlocks the door.

The Karoq has run as a single generation (with a 2022 facelift) since launch. The procedure here covers the whole range; only entry-spec cars without KESSY use a turn-key ignition.

Start the Karoq With a Dead Fob

KESSY (button-start) Karoq:

1. Unlock and get in with the emergency blade first (next section).
2. Hold the brake pedal firmly down.
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 energises the chip by induction, confirms the key, and starts the engine.
5. If nothing happens, shift the fob slightly on the button and try again — the read zone is small.

Turn-key Karoq:

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

Unlock the Karoq With the Emergency Key Blade

1. Slide the catch on the fob and withdraw the metal emergency blade.
2. On the driver’s door handle, a plastic cap conceals the lock barrel. Lever it off using the slot at the rear of the cap.
3. Insert the blade and turn to unlock. Manual entry can set off the alarm; pressing START with the fob in the cabin clears it.
4. Continue with the contact-start method (KESSY) or the ignition barrel (turn-key).

Why the Immobiliser Still Recognises the Key

The Karoq’s fob holds a passive immobiliser transponder powered wirelessly by the car’s reader coil — the coin cell is not involved in authenticating the key. The battery only drives the long-range radio for remote locking and keyless approach. Press the fob to the START button and the short-range coil powers the chip directly, so the immobiliser verifies it and releases the engine. A battery-free spare blade key would start the Karoq the same way.

Replace the Key Fob Battery

1. Remove the emergency blade to release the case.
2. Split the fob halves with a plastic pry tool along the seam.
3. Take out the old cell — the Karoq fob uses a CR2032 3V coin cell.
4. Fit the new battery + side up to match the original, 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 Karoq have keyless start? Many do — KESSY is widely fitted, particularly on SE L and SportLine trims. A START/STOP button instead of a twist key means you have it.

Where is the contact point on the Karoq? Behind the START/STOP button. Hold the flat back of the fob directly against it.

How do I open the Karoq 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 Karoq fob take? A single CR2032 coin cell.

It only starts when I hold the fob to the button — is that a problem? That usually means the coin cell is weak or flat. Replace it; if the behaviour continues, the key transmitter may be failing.

If a warning light stayed lit once the engine is running, decode it on our sister site autodtcs.com.