The speed sensor on a 4-cylinder Pontiac Fiero is located on the
transmission. Specifically, it's usually on the
output shaft of the transmission. However, the exact location might vary slightly depending on the year and transmission type (automatic or manual). You'll likely find it near the speedometer cable connection point (if it has a mechanical speedometer) or near the wiring harness coming from the transmission.
Because it's inside the transmission housing, accessing it will require at least partial transmission removal or dropping the transmission low enough to reach it. A repair manual specific to your Fiero's year and transmission type is highly recommended for precise location and procedure.
