These instructions apply to the Renault Clio Mk4 (X98) 2012-2019.
For other models, please choose your vehicle here.
Renault Clio (Mk4, 2012–2019) uses Renault’s hands-free keycard rather than a conventional fob, so a flat card battery behaves differently to a normal car key. The good news is that the card’s transponder is passive: it does not need its own battery to start the engine. When the keycard battery dies you can still get into the car and drive it, you just have to use the card slightly differently. This guide covers exactly how, including how to unlock the door when the central locking will not respond.
The first sign of trouble is usually the “Keycard battery low” message on the instrument cluster, sometimes weeks before the card fully stops talking to the car. Treat it as a reminder to fit a fresh cell rather than an emergency.
Starting the Clio Mk4 with a dead keycard
The Clio Mk4 came in two ignition styles depending on trim. Lower trims (Expression, Authentique, Play) have a card slot in the dashboard; higher trims have full hands-free push-button start. Identify yours and follow the matching steps.
- Get into the car first using the emergency key (see the next section).
- If your car has a card slot (a thin letterbox-style slot on the dash, near the steering column): push the keycard firmly into the slot until it clicks home.
- If your car has push-button start (no slot): hold the keycard flat against the START/STOP button so the chip sits right on the button.
- Press the brake pedal fully.
- Press the START button. The engine should crank and start because the car’s antenna energises the card chip directly.
- Drive as normal, but do not switch the engine off until you have fitted a new cell, since the car may refuse to restart if it can no longer detect the card.
Unlocking the door with the emergency key
With a flat card battery the remote lock and unlock buttons stop working, so use the metal blade hidden inside the card.
- Press the small release catch on the card and slide out the integrated emergency key blade.
- Go to the driver’s door. The lock barrel is usually concealed under a small cap on the door handle.
- Prise off the cap with the key blade or a thumbnail to expose the lock.
- Insert the blade and turn to unlock. Opening the door this way may trigger the alarm; it stops once you start the car with a recognised card.
- Slide the blade back into the card body before driving.
How the card slot and transponder work
The keycard contains two systems: a battery-powered radio transmitter for the remote buttons, and a battery-free transponder chip read by the car’s immobiliser. When you insert the card into the dash slot, or hold it on the START button, the car’s antenna ring sends out a field that powers the chip just long enough to read its code. That is why a totally dead card still starts the engine, but will no longer lock or unlock the car by remote.
Replacing the keycard battery
The Clio Mk4 card uses a single CR2032 3V coin cell.
- Slide out the emergency key blade, which releases the card cover.
- Unclip the rear cover using the small tab to expose the battery.
- Lift out the old CR2032 and fit the new one with the “+” side facing as marked.
- Clip the cover back on and reinsert the blade.
- Stand next to the car and press a card button a few times to re-sync it. The low-battery warning clears once you next start the engine.
Frequently Asked Questions
Can I start my Clio Mk4 with just the emergency key? No. The metal blade only unlocks the driver’s door. The card itself must be present in the slot or on the START button for the immobiliser to allow starting.
Which battery does the Clio Mk4 keycard take? A CR2032 3V lithium coin cell. It is the same cell used across the Clio IV, Captur and Megane card range.
Why does my card still work sometimes? A weak cell may transmit intermittently. Once the “keycard battery low” message appears, fit a fresh CR2032 before it fails completely.
My car has no dash slot, where do I hold the card? On hands-free Clio Mk4 trims, press the card flat against the START/STOP button while pressing the brake, then press START.
Will opening the door with the blade set off the alarm? It can. The alarm cancels as soon as the car reads a valid card and you start the engine.
If a fault light or stored code appears after the keycard goes flat, you can look up what it means on autodtcs.com.
Independent guide — not affiliated with Renault. Always follow your official service manual and safety precautions. Read our full disclaimer.