One problem related to o2 sensor has been reported for the 2000 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Subaru Legacy based on all problems reported for the 2000 Legacy.
Vehicle would hesitate at 35mph or less. Had taken vehicle to dealership 6 times for stalling. Mechanic had replaced oxygen sensor & coil packs each time. Even had it test driven. Problem could not be resolved.