https://www.thekeylab.co.uk/carkeyrepair/ How to Repair a Remote Key While most remote key fobs have impressive battery lives they will eventually wear out. Sometimes it's as simple as replacing the batteries, but occasionally there are more serious problems. A quick fix that can aid is to disassemble the remote and cleaning the buttons before flexing them in and out. These techniques may be all you need to get your key fob working properly. Battery If the fob is working, you can swap out the CR2025 or CR2032 battery. If not accessible, you can take it off the fob and examine the battery terminals and buttons to look for signs of wear or broken parts. Most of the time, the buttons and terminals can be repaired by soldering them back into place however you'll need know exactly what type of battery is used by your fob. If you're not sure if the battery is the issue, try using an alternative key fob to see if you can unlock or start your vehicle with it. If it's possible, it's time for a replacement of the primary fob. If not, a professional check is necessary to determine the reason it's not functioning properly. It could be as simple as reprogramming it, or require other types of repair. There's also the possibility that your car has lost your fob, which isn't something you can fix yourself. Case Study The case of a remote key is the plastic housing that covers the outside and usually comes with the button pad that is replaced. It is recommended to use an entirely new case since the original one will likely to be extremely filthy. Additionally, it is essential that the circuit board in the case is properly positioned. The circuit board determines the function of the key fob. You can test it with an instrument set to RF (radiofrequency) mode and a radio scanner that is tuned to the same frequency as the key fob. Check the contact points on the keys on the keypad. They may be loose over time, or even broken. By carefully re-soldering them back into place will often res