Car Key Fob Repairs
Key fobs today are more than just a way to unlock and start vehicles. This added complexity can lead to expensive repair bills if it breaks.
The good news is that most fobs have flat-watch-style batteries that are easy to replace at home. You might find that a simple reset can make your fob work again.
Battery Replacement
A dead battery is the main reason for a key fob not working. It's a simple fix and worth trying before you purchase a replacement fob. Simply take your car to an hardware or auto parts retailer that carries button cells and choose a replacement. You can also consult the owner's manual (or in the event that you don't have one, YouTube is full of videos from people explaining how to do it) for specific instructions for opening and replacing the battery on your particular type of fob.
You'll have to gently pull apart the sides of most fobs in order to access the battery. You'll require a small flat-bladed screwdriver, or a different tool with a small blade. It may be helpful to look for a notch on the lower edge of the fob that you can use to put your tool in between. You might also want to look out for small pieces that may come loose while you work.
Insert the new battery in the same way you removed the old one. The positive (+) side should be facing the buttons, while the opposite side is facing (-) the marks on the compartment for the battery.
You can push a button to test the fob. If it doesn't work, there may be a problem with your vehicle that requires to be fixed or replaced by a specialist.
Some key fobs are difficult to open, and the contacts could be fragile and easily corrosion-prone. In these cases the best choice is to consult a car specialist or a dealer. If you need to replace batteries, you should be gentle and follow the instructions specifically in the owner's manual. You may be able find an identical battery in a big-box store or discounter, but be sure you check the owner's manual to make sure it is compatible with your vehicle.
Replace the internal key
To guard against theft, many key fobs are equipped with an electronic key inside. When the battery in the fob fails, a blank key is left behind, which can be used to open trunks and doors. In certain cases, this key can even start certain vehicles. Most people do not realize that they can avoid a trip to a dealership by replacing the fob's batteries. The majority of modern fobs utilize flat watch-style batteries that can be found in hardware stores and auto parts shops. Using the correct type of battery is important however. The wrong kind can damage the electronic circuitry, which can cause the battery to fail sooner.
If the problem persists even after you have replaced the battery, it may be an indication that there is something else going on with your vehicle. If you have an owner's guide and you're not sure, try to determine if you can use a reset procedure to restore the fob's factory programming. If this fails, you'll need to visit a dealership or a shop independent that specializes in vehicle-security systems and key fob programming.
Fobs may also fail because of faulty transmitter receivers. These are usually located close to the steering wheel or on the dashboard. They transmit signals that enable you to unlock your vehicle and start it using the fob. It is possible that you will need to get closer to the car to get it to work.
A professional might have to open the fob's case to replace the transmitter. A simple screwdriver will usually get the job done however some fobs come with complex release mechanisms that require a specialized tool or equipment that is available only through a dealer. This job must be handled by a certified mechanic to avoid damaging the fob as well as yourself.
Reprogramming the Key
A key fob that's not working might just need an upgrade in battery. Since these batteries are inexpensive and easily available at pharmacies and home improvement stores, this is a good first step before purchasing the purchase of a new car key fob.
Alternately, you might be able to re-program the fob on your own by following the steps. The procedure may differ for different vehicles, so you should consult your owner's guide and research your specific model. For example the key fob might require the ignition to be switched on while reprogramming the key. One key fob may require the key to be inserted several times.
The process is straightforward. First, make sure that the new battery is firmly in place. Then, get in the driver's seat and close all doors, with the exception of the driver's side door. This will ensure the new key is communicating with the vehicle properly. Then, place the old key back into the ignition and turn it on to the ON position, but do not start the engine. Next press the lock button on the fob, while making sure to point it towards the transmission receiver, which is usually located on the front of the vehicle above the mirror. In a short period of time, the key will indicate to the vehicle that it's being programmed by triggering the doors locks or emitting a chime. This procedure can be difficult, so car keys repair it's important to pay attention to the timing and don't over-press the key button.
If the key fob won't function after reprogramming, you can try using new batteries. If the problem persists you may want to visit your local locksmith or dealer. A professional will have the tools and equipment needed to reprogram your car's fob, or create an entirely new key if required.
Genesky says he can usually program newer fobs at around $200 to $250, based on the model of vehicle. He's experienced European models rejected because there isn't the equipment required. The majority of aftermarket fobs can be programmed, but always check with your local car dealer to find out the cost.
How do I get a new fob
If your key fob cannot be repaired, you may need to buy an entirely new one. Based on the make and model, the dealer or an auto locksmith may be able to help. The dealership is likely to be the most expensive option for a fob replacement, but they will also have all the required tools and software needed to program your car correctly. Many independent locksmiths provide a new car key fob at an affordable price.
Before you decide to purchase a new fob it's recommended to consider resetting your current one. Your owner's manual should outline the proper procedure for reset which is typically the pushing of a button which restores it to factory programming.
You should also look over the owner's guide and warranty information to see if you can get an additional fob for your key. If your vehicle is under warranty or you have a car insurance policy or auto club membership that provides bumper-to-bumper protection, you may be eligible for reimbursement for the cost of a new fob.
Finding the right place to get a fob can be a challenge. If you own a new car and would like the peace of mind that comes with knowing that your key fobs are in good working condition, you might be better off visiting the dealership to get this service. If you're seeking a less expensive alternative, it's possible to find a locksmith that will provide the same service for a lower price.
If you aren't comfortable handling this kind of work yourself, a professional locksmith can be a great choice. They are equipped and trained to replace or reprogram key fobs for cars of all types and can do it quickly. In addition, a locksmith can often come to your office or home to complete the task, which can be very practical for some. They can even cut and program keys on the spot if you have lost them, which is ideal for those who do not want to leave their cars in the dark.