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Call your car dealership. All car manufacturers feature links on their websites, where you can input your ZIP code to search for the dealer nearest you.

Ask to speak to someone in the maintenance department. Explain in detail the issues you are having with your car remote. Sometimes the issue is one that is easily fixable and the mechanic can talk you through the process of fixing it over the phone. If its not, youll need to take the remote to the dealership.

Give the remote to a mechanic and ask whether you should wait in the reception area or come back later for the remote.

Contact your local Mercedes-Benz dealership. Your 1995 E320 comes with a keyless entry system that requires a special key manufactured by Mercedes-Benz USA to operate the vehicle.

Provide Mercedes-Benz with the vehicle identification number, or VIN, and the year of your Mercedes E320. The VIN is located on all of your purchase paperwork, insurance cards and on the door panel of the drivers door. MB needs your VIN because it contains the key code for your specific vehicle, which lets them know exactly how to cut your new key to make it work with your MB.

Pick up your new key from Mercedes. Before you pay for and leave with your key you must be able to prove you own the vehicle by providing proof of ownership. Photo identification along with your purchase paperwork, title, registration and/or insurance card are all acceptable.

Find the VIN and record it. The VIN is typically on a stamped metal plate on the drivers side of the dashboard. It is also stamped inside the engine compartment, on the engine or on a tag attached to it.

Take the VIN to an automotive dealer for that model.

Present to the dealer proof of ownership. Requirements will vary, but duplicate title in your name is recommended.

The dealer will contact the manufacturer to have a duplicate key made. This may take a few hours to a few days.

Locate the trunk release button or latch located near the driver seat. Most current vehicles have a manual trunk release. The release is usually located on the left floorboard near the driver seat, on the driver door below the armrest area or on the dashboard to the left of the steering wheel.

Fold down the back seat to access the trunk area and crawl into the trunk and pull the manual safety release. All vehicles built since 2002 are required to have a glow-in-the dark manual safely release in the trunk to prevent children or others from being accidentally locked in.

Contact a locksmith or your auto dealer. A locksmith will be able to pop open the lock and may be able to get a new key made for the lock. A dealership may be be able to create or order a new key if provided the vehicle identification number and proof of ownership. If the passenger compartment is also locked and inaccessible, contacting the dealer or a locksmith will help prevent damage being caused to the vehicle during attempts to get inside.

Step into your 2005 Ford Ranger with your two programmed keys and your blank.

Insert a programmed key into the ignition. Turn to "On" then to "Off" and then remove the key.

Insert your second key. Turn it to "On" then to "Off" and remove. This must be done within five seconds of the first key.

Insert the blank key into the ignition. Again, turn this to "On," hold for one second and then turn it to "Off." This must be done within 10 seconds of the first key. The security light will flash if the procedure has been successful.

Find the vehicle identification number (VIN) of your Commander. The VIN is located on the engine, on the inside of the drivers door panel and on the bottom left side of your windshield. You can also find your VIN in your purchase paperwork, insurance paperwork and your title or registration paperwork.

Contact your local Jeep dealership or any professional locksmith. Give them the VIN to your Commander. The VIN holds information for your specific Commander that you will need to have a replacement key made. Commander keys have internal computer chips that are linked to their specific car, and your replacement key will need to be programmed by the Jeep dealer or locksmith to respond to your Commander.

Visit the Jeep dealer or locksmith. Locksmiths can come to you if you dont have transportation to their offices or to your Jeep dealership. Wait while your car key is made and programmed and pay the fee for the services provided to you.

Remove the plastic shroud around the steering column in order to access the lock cylinder mechanism. The exact procedures for removing the plastic column covers will vary by truck, depending upon the options you specified. But look all around the shrouding, locate all the relevant screws and remove them. You should now see the ignition lock and the three wires -- orange/black, yellow and red/white -- connected to the Passlock II sensor.

Cut the orange/black starter wire and strip the ends so that you can reconnect it afterward. Do the same with the yellow Passlock II sensor wire. Crimp a male and female weather-tight quick-disconnect onto the ends of the wires so that you can quickly reconnect or disconnect them as needed.

Set your digital multimeter to read in ohms. Touch the negative (black) probe to a body ground, and the positive (red) probe to the key-side yellow Passlock wire. The resistor that your measuring is contained within the Passlock sensor itself, so thats what youll be measuring.

Turn your ignition key to the "start" position, and monitor the readout on your DMM. Record the reading in ohms. Repeat three to four more times, record each measurement and calculate the average. The PL2 sensor may not give the same reading every time, but the computer expects a bit of variance. You should see a reading of between 400 and 13,700 ohms; this is the resistance or "r-code" of your trucks ignition.

Place your key in the ignition of your Mercedes-Benz, without turning the ignition on. Look for a glowing red light on the key, which means that your car is programming itself to your key. This process can take up to an hour to complete. This method of programming does not work on every year or model.

Call your local Mercedes-Benz dealership if you tried programming your key in the ignition unsuccessfully. Schedule a time to visit the dealership to have your keys programmed to your vehicle.

Provide the Mercedes dealership with the key code to your car, which is located in your purchase paperwork, or with the vehicle identification number (VIN) of your Mercedes, by which the dealer can determine the key code to your vehicle. Wait while your vehicles keys are programmed and pay for your smart keys.

Call a Chrysler vehicle dealership and ask to speak with someone in the maintenance department.

Explain in as much detail as you can the problem you are having with your Chryslers key fob. For example, if your key fob works only to unlock your doors but not to lock them, explain that this is your issue.

Replace the battery. According to Chrysler, the most common problem with key fobs is simple: the battery is dead. You can pick up a battery from an auto parts store by giving the clerk the year, make and model of your car. Chrysler mechanics recommend picking one up and using a knife to pry apart the two pieces of your key fob, exchange the old battery for the new battery and trying your remote. If your remote still does not work, make an appointment to take it to Chrysler.

Take your key fob to the Chrysler dealership -- if applicable -- and pay for the repair once your fob is fixed or your fob is deemed irreparable and you have to order a new one.

Search for your missing car keys. Unfortunately, there are no remotes, signals or devices that can locate your missing Prius smart keys. Re-tracing your steps from the last time you had your key is a good search method. Check your pockets, handbags, between cushions on your furniture and anywhere else you might have gone while you had your keys. If you cannot locate them youll need to have replacements made.

Call your local Toyota dealership to schedule an appointment to have your keys replaced and programmed to work with your late model Prius.

Call a local towing company to have your Prius towed to your local Toyota dealership. Your new key cannot be made and programmed with your Prius internal computers without your car being present at the dealership.

Pay for your new car keys. The cost for a smart key for a Prius is around $200.