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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly When you have a key fob that will not start or function properly It can be frustrating. There are simple steps you can follow to fix the problem. The first step is to remove the emergency key made of steel from the key fob. Use the flat end of a key in metal to press the cover down and twist it open. Keyless Entry System The keyless entry system is a wonderful option for anyone who owns a car. They allow you to unlock your car before you even touch a handle or walk out of the doorway for the passenger. Some even turn on the lights as you approach or open the trunk if it's filled with groceries, or activate 10 other electronic accessories in response to your proximity. The key fob transmits a radio frequency signal the receiver inside the car which then transmits a response code back to the vehicle. The signal only works only if the keyfob falls within a certain area, usually 50 feet or less. Some of these systems are one-way, meaning the key fob will secure or unlock the vehicle, but cannot start the engine. It is recommended to have your keyless entry system installed by a professional, regardless of the type. A reputable locksmith for cars will ensure that the connection is safe and secure, even if that involves stripping a small portion of each wire. The manual will tell you which wires to use. Another perk of keyless remote access is that it can also lock your doors automatically when you step away from your car. This is beneficial for those who forget and often leave their vehicle unlocked for all day. Transponder Keys Transponder keys or transponder chips are an aplenty feature in modern vehicles. The chips are incorporated into the head of a key or fob and include a unique code that is linked to your vehicle's immobilizer system. The antenna ring at the top of the ignition transmits a signal to the transponder chip whenever the key is inserted and turned on. The chip sends an algorithm for code-matching to the antenna ring. Transponder chips prevent theft since the keys must be properly inserted using the right code to turn your car on. They are also more difficult to duplicate, making it less likely for someone to take your car. A reputable locksmith can produce transponder keys that are programmed to match your vehicle at only a fraction of the price you'd have to pay at a car dealership. They can also help understand what type of key you have and how to program it to match your car. They may even be able to give you an alternative to the transponder that was stolen or lost key. They may also be able to help you with reprogramming the chip in case it is not working. Duplicate Keys If it's your car key or your house keys, the majority of people have lost their keys at some point in their lives. It can be frustrating to be locked out of your home or car. To avoid this problem it is essential to keep duplicate keys on hand. The duplicate keys will help you open your lock if you ever find yourself stuck. Most duplicate keys are stamped or engraved with a “do not duplicate” message. This is a way to let others know that it's legal to duplicate the key unless you're the owner of it. Keys are used to open padlocks and deadbolts as well in other door locks. They are also great for keeping the track of which keys belong to which customer. Many people believe that the “do duplicate” message on the keyboard makes it more secure. This is not the case. The message engraved on the key is merely a warning and has no legal weight. However, it could discourage some people from trying to duplicate their keys. Many chain hardware stores will not cut these keys, however locksmiths are able to duplicate the keys. In replace lexus key , they can be cut with a lookalike blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob has stopped functioning, it's likely to have to be programmed to work with the immobilizer system of your vehicle. You'll need to contact an locksmith or a dealer to program the ECU. Typically, a locksmith will cost more than a dealership, but they'll also save you the headache of having to take your car there. In addition to the ECU it's possible that your battery may need to be changed. It is necessary to replace your old battery with one that's compatible with the specifications of your vehicle. This includes the physical size, terminal configuration, and cold cranking amps or amp-hour rating. If you install an insufficient battery it could cause serious damage to the engine and other components. Make sure to check the warranty prior to purchase a new battery to determine if the price is covered. It is also important to determine whether you require a warranty in the event that the battery fails within its warranty time. Also, be aware that automotive locksmiths often don't carry the tools needed to code keys, and you'll have to find a dealer or an online key programmer to program the key for you. It's also important to let them know the type of key you want (chip smart, intelligent remote, or “push-to-start”) and the year your car was and the VIN in the event that you can.