How to Replace the Battery in a Peugeot 408 Remote Key?

[LeAaron]

Remove the mechanical key and locate the hole for removing the mechanical cover plate. Insert the mechanical key into the hole and gently pry open the key with your hand to open the key cover plate. Take out the old battery, install the new battery, cover the car key's cover plate, and finally reattach the mechanical key. Below are some related introductions about the key battery: 1. When the battery needs to be replaced, a prompt message will appear on the combination instrument display. When installing a new battery, pay attention to the positive and negative positions, properly close the remote cover, and reinitialize the remote. 2. During daily use of the key, do not place the key near high-power appliances such as TVs, microwaves, washing machines, or computers, as these appliances can cause the remote battery's lifespan to decrease. 3. Do not expose the key to environments below 0°C (too cold) or above 50°C (too hot), as this will significantly reduce the battery's lifespan. Avoid repeatedly operating the remote outside its working range, as this may cause the remote to malfunction. If the remote malfunctions, it needs to be reinitialized. When the key is inserted into the ignition switch, the remote will not work even if the ignition switch is turned off.

[AliviaLee]

My last experience changing the Peugeot 408 key battery was quite a process. There's usually a small seam on the back of the key. I used a thin coin or flathead screwdriver to gently pry open the edge, being careful not to apply too much force to avoid damaging the plastic casing. Inside, you'll find a CR2032 coin cell battery. Simply remove the old one and replace it with a new one - make sure it's the correct model, available at supermarkets or auto parts stores for about one yuan. Before reassembling, confirm the battery orientation with the positive side facing up, press it firmly into place, then close the cover. After replacement, remember to test the remote unlocking function to avoid failure while driving. Older keys are prone to poor contact, so regular battery checks can prevent unexpected issues. Always carry a spare key as backup.

[DelColin]

As someone who often helps neighbors with car repairs, I know the key to replacing the Peugeot 408 key battery lies in the little tricks. Turn the key over to its backside, locate a small groove, and use a thin tool like a flathead screwdriver to gently pry open the edges and separate the casing. The battery is usually a CR2032 coin type—remove the old one and insert the new one, making sure the polarity is correct (the positive side should face the top of the key). After replacement, press the key firmly to test if it responds. The batteries aren’t expensive; you can find them online for just a dollar each, saving money and hassle. Avoid handling with wet hands to prevent water damage to the internal circuits. The key casing is fragile, so handle it gently.

[RebeccaRose]

When I bought my new Peugeot 408, a friend taught me how to change the battery. It's quite simple: there's a small groove on the back of the key, gently pry it open to reveal the coin battery, then replace it with a new CR2032 model. Make sure the positive side faces up when installing the battery to avoid reversing it. Close the cover and press firmly to test the remote unlocking. The whole process takes less than two minutes, saving both money and hassle by doing it yourself.