What is the purpose of the IMMO engine control unit in an Audi 80?

I am currently replacing my old IMMO engine control unit in my Audi 80 and I was wondering what its main purpose is. Will it affect my car's performance and how do I know if I need a new one?

The IMMO engine control unit (ECU) is responsible for regulating and monitoring the engine's fuel injection, ignition timing, and other essential functions. It is a vital component in ensuring your Audi 80 runs smoothly and efficiently.

If your ECU is malfunctioning, you may experience a decrease in engine performance, reduced fuel efficiency, and other issues. It is important to regularly check and maintain your ECU to ensure optimal performance of your Audi 80.