Here it the procedure for 're-learning' the master key for my Chevy Malibu. I assume that most Chevy's that have a transponder work this way well:

1.Get the key information

The most important key information is the Chip Model(like 4D67) and remote control frequency(like 315MHZ).

Once you get access to your car, you can use key programmer to connect with your car and get the detailed key information.

If you do not have a key programmer, you may also find the key information at the key manual or ask the car dealer for them.

For some popular vehicles, we usually know what kind of key is compatible. But for some not popular ones, you'd better make it clear.

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A car key usually consist of three parts:

1. The remote control. 

2. A transponder chip.

3. A key blade.

Here is a step by step guide to tell you how to estimate the shipping cost.