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What Can a Car Keys Programmer Do For You? A car key programmer is a complete diagnostic tool that offers many functions. Some are expensive while others are affordable. The majority of these tools are compatible with a variety of brands and models. However, some cars require an expert to reprogramme the keys. This is due to the fact that they use an exclusive key system. Keys with a transponder A car key with a transponder is an electronic security feature that makes it very difficult for someone to steal your vehicle. T