What does the diagnostic code 42 mean for a 1991 mr2 turbo?

The diagnostic code 42 for a 1991 MR2 Turbo indicates a problem with the throttle position sensor (TPS). This sensor monitors the position of the throttle plate and sends input to the engine control unit (ECU) to manage fuel delivery and engine performance. If the code is triggered, it may lead to issues such as poor acceleration, stalling, or erratic engine behavior. It's recommended to inspect the TPS and its wiring for faults or malfunctions.