Five Things Everyone Makes Up On The Subject Of Key Repair

How to Repair a Remote Key
Although most remote key fobs come with an impressive battery life, they do eventually wear out. Sometimes it's as simple as replacing the batteries, but sometimes there are more serious issues.
Take apart the remote and clean the buttons. Then bend them out and in. These techniques might be all you need to get the key fob to work.
Battery
If the fob is still working you can replace the CR2025 or CR2032 battery. If it's not then you can remove the fob and examine the battery terminals and buttons for any indication of looseness or broken parts. Most of the time, the buttons and terminals can be re-soldered back into place however you'll need be aware of the exact type of battery the fob is using.
If you're not sure whether the battery is the issue, make use of a backup fob to unlock or start your car. If you are able to do so, it's time to replace your primary fob. If not, a professional check is required to determine why it's not functioning properly. It could be a simple reconfiguration, or it may require other types repair. You may also find that your vehicle has lost the fob. This isn't something you can fix by yourself.
Case
The plastic housing that covers the outside of a remote is referred to as the case. It is usually equipped with an additional button pad. It is essential to choose an entirely new case since the original will probably be a bit shabby and it is vital that the circuit board is set correctly inside the case. The circuit board controls the key fob's function. You can test it by using an instrument set to RF (radiofrequency) mode and a scanner that is tuned to the same frequency as the key fob.
Examine the contact points of the keys on the keypad. They could have become loose over time or have been damaged. By carefully re-soldering them back into place can often return the functionality of the keypad unless they completely snap off.
Buttons
If the buttons on your key fob don't work anymore or are difficult to press you may need a dorman or motormite remote key housing replacement could be bought inexpensively online for your year/make and model. Then, you can slide the circuit board out of your old case into the new one. For certain models you may have to move the board slightly. The black contact points of the buttons can be adhered to with aluminum foil and double-sided tape.
Programming
The key fob and receiver in your car are connected however, this connection may be ruined. A professional will examine the vehicle to determine the make of the vehicle, year of manufacture and model. They make use of specialist equipment to repair or program a blank fob or transponder chip (or clone a key should this be possible). Then they test the remote to make sure it functions.
It is important to be cautious when reprogramming a blank key, as the process can be a bit complicated and different brands require distinct steps. It is also possible to skip a step or delay too long before leaving the programming mode, therefore it is recommended to hire a professional with comprehensive knowledge of the security system of your vehicle to minimize the risk of damaging the car. Certain key programming tools can also be capable of reading diagnostic trouble codes from your vehicle, which can help repair or troubleshoot further problems.