How to Repair a Dead Car Key
Sometimes extreme cold or heat can cause a car key to not function properly. It is best to wait a few minutes before spending money to replace it.
If your car keys are damaged, it's a real trouble. It happens at the worst possible time! There are a variety of ways you can repair the broken car key that don't require the purchase of a new key.
Dead Key Fob Batteries
Modern key fobs allow us to unlock doors, trunks and tailgates with ease without the need to search for a car key. Some key fobs even come with a built-in key that can be used to start our cars. However, these key fobs depend on a tiny battery that provides power to their remote functions. If the battery is dead then the key fob can no longer transmit the signal needed to turn on the vehicle. There are a variety of ways to repair a dead key fob and get your car operating again.
First, determine whether the key fob actually dead. If it appears dead, you'll have to replace the batteries. You can do this yourself by taking the key fob off its clip or using a small flat head screwdriver to break it. Do not apply too much force, or you could damage the fob. It is also important to ensure that you're using the correct kind of battery. Most key fobs use CR2032 3-Volt batteries, but certain models may require something different. You can determine what type of battery your car requires by consulting the owner's manual, or you can visit an Interstate All Battery Center and get a specialist in battery care to assist you.
Suggested Looking at is possible to revive the key fob which isn't dead by moving it closer to the vehicle. The majority of key fobs employ RFID (radio frequency identification), which only works at a short distance. The ignition system has to be able detect the signal. You can unlock your vehicle or even start it by moving a few inches closer.
Many car manufacturers have backup mechanisms that can be activated when the battery of the key fob is dead. For instance, many Ford models come with a designated slot for the key fob which will activate the engine when properly inserted. You can find the instructions in your owner's guide on how to locate the slot and insert the key fob in the correct way. If you're not able to get your car started by using this method, call roadside assistance.
Broken Key Ring
The chip in the key fob is what communicates with your car's immobilizer system in order to start the engine. This chip can be damaged or there could be programming mistakes. If this occurs the key fob won't be able transmit the correct identification code, and your car won't begin. A malfunctioning transponder could be caused by physical damage to the key shell or wear and tear on the contact pads.
There are a lot of warning signs on your dashboard if the key fob is having trouble communicating with the immobilizer system of your vehicle. These include error messages flashing lights, or the key not locking the car. If you notice these warnings contact your local locksmith immediately to request a replacement key fob or repair.
When you carry many keys, it's easy to scratch your key ring. This could cause the fob to break in half. This is one of the most common causes of a broken car key. You can apply super glue on both sides of the crack and gently press them together to fix the problem. Use a gel-type of glue that drys slowly to prevent drips or runniness.
If this method doesn't work, it's important to get in touch with a professional locksmith right away to prevent any further damage to your vehicle. A locksmith who is qualified will be able to repair or replace your fob quickly and will ensure that the ignition and door locks do not get damaged in the process.
If your key fob gets damaged it can be frustrating and uninviable. It's not cause for anxiety or anger. Instead, you can take proactive steps to minimize the chance of your key fob breaking again in the future, including regular maintenance, using key protectors and keeping an extra key. If you do encounter problems with your key fob, Quicksmith's team Quicksmith is available to assist!
Broken Key Loop

One of my MK5 keysfobs fell off the little key ring that is at the top, which is where it joins the keyfob. It's made of plastic or soft metal. I've punched a hole and wet-sanded it to make it stronger, but I suspect that the issue isn't solved by that.
I've also tried wrapping the broken part of the ring using clear tape, but that didn't seem much better. It's a shame because I use the little split ring to keep my keys in place.
If the key fob's case is damaged, you could often remove it and replace the battery if the battery isn't already dead. There are online kits available however they're only a temporary solution. It's better to get it fixed by a professional. You may also find the replacement case at an home improvement store or a locksmith. They are not likely to cost as much as a new key fob.