One problem related to check engine light on has been reported for the 2002 Subaru Legacy. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Subaru Legacy based on all problems reported for the 2002 Legacy.
1) check engine light lit;2) hesitation at dangerous times, especially through turns, occasional backfiring;3) three times in shop for warranty work, replacing air/fuel ratio sensor and reprogramming ecm/ecu/pcm.