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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be a hassle when your key fob doesn't function or switch off. Fortunately, there are a few steps you can do to fix the issue. First remove the metal emergency keys from the key fob. Use the flat edge of a key made of metal to press the cover, then turn it to open. Keyless Entry System Keyless entry systems provide a huge option for anyone who owns a car. They let you unlock your car before you even touch a lever or step out of the passenger door. Some of them will even turn on the light as you approach. Some will even open the trunk when carrying groceries or other electronic devices that are based on proximity. The key fob sends a radio frequency signal the car's receiver and it then transmits a response code back to the vehicle. The signal will only be valid if the key fob is within a specified range, usually about 50 feet or less. Some of these systems are one-way, which means the key fob is able to secure or unlock the vehicle, but cannot start the engine. It is recommended to have your keyless entry system professionally installed, regardless of the type. A reputable locksmith for cars will ensure that the connection is secure and complete, including stripping a small part of each wire in order to connect it. The instruction manual will show you the specific wires to use and it is vital to only use the ones you need. Another perk of keyless remote entry is that it can also lock your doors automatically when you step away from the vehicle. This is helpful for people who forget and often leave their vehicle unlocked for long enough. Transponder Keys Transponder keys, also known as transponder chips are a typical feature in modern vehicles. These chips are built into the head of a key or fob and contain a unique number that is connected to your vehicle's immobilizer system. The antenna ring located at the top of the ignition sends signals to the transponder chip once the key is inserted, and then turned on. The chip sends an encoding response to the antenna ring. Transponder chips are a deterrent to theft, because the keys must be correctly inserted with the correct code to turn the car on. These keys are also difficult to duplicate, which makes it less likely for someone to steal your vehicle. A reputable locksmith can make transponder keys that can be programmed to work with your car at a fraction of the cost you'd pay at a dealership for cars. They can also help you understand the type of key in your possession and how to program it. They might be able to offer you a replacement key to replace your stolen or lost transponder. They may even be able to help you reprogramme your chip if it's not functioning. Duplicate Keys No matter if they're your car keys or your house keys, the majority of people have lost their keys at some time in their lives. It's frustrating to be locked out of your house or car. To avoid this situation, it's important to keep duplicate keys in your possession. The duplicate keys will help you open your lock should you ever become stuck. The majority of duplicate keys are stamped or engraved with a “do not duplicate” message. This is a way to let people that it's not legal to copy the key unless you're the owner of the key. These keys are used for padlocks and deadbolts as as other door locks. They are also great for keeping an eye on which key belongs to which customer. Many people believe that the “do duplicate” message on a keyboard makes it more secure. This isn't the case. The message engraved on the key is only a warning and has no legal weight. It could discourage some from attempting to duplicate their keys. G28CarKeys do not cut keys. However locksmiths can easily duplicate them. They can be cut on a blank that appears like the original, to ensure the accuracy. Battery Replacement If your Lexus keyfob isn't functioning, it may need to be reprogrammed in order that it can work with the immobilizer system in the vehicle. You will need to contact an expert locksmith or go to your dealer to change the ECU. A locksmith will usually charge more than the dealership, but you'll save yourself the headache of towing your vehicle. In addition to the ECU there is a chance that your battery will need to be replaced. You'll need to replace your old battery with one that's compatible with the specifications of your car. This includes the physical size as well as the terminal configuration and cold cranking amps or amp-hour rating. If you install an incorrect battery it could cause severe damage to the engine and other components. Check the warranty before you buy a new battery to determine if the price is covered. It is also important to determine whether you need an insurance policy in the event that the battery fails within its warranty period. Additionally, you must be aware that auto locksmiths typically don't have the tools needed to code keys, so you'll need to get a dealer or online key programmer come in and program the key for you. It's also essential to inform them know what kind of key you want (chip or intelligent remote, or “push-to-start”), the year that your car was, and the VIN If you have it.