What is an EFI FHTR on Toyota Corolla?

The EFI FHTR on a Toyota Corolla is the Electronic Fuel Injection Feedback Height Adjuster. It is a part of the engine management system that helps to maintain optimal fuel efficiency. The EFI FHTR works by measuring the amount of air flowing into the engine and adjusting the amount of fuel that is injected accordingly. This helps to ensure that the engine is getting the right amount of fuel to operate efficiently. If the EFI FHTR is malfunctioning, it can cause the engine to run rich or lean, which can lead to a loss of power and fuel economy.