One problem related to o2 sensor has been reported for the 2001 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Hyundai Elantra based on all problems reported for the 2001 Elantra.
Check engine light came on three different times first repair was engine manifold, second repair was oxygen sensor, third time the dealer could not find the problem. Dealer probably unplugged the light all repairs were under warranty but dealer suggested I get the service done since they had it in the shop. Both sun visor plastic clips that hold the visor in place broke off and on the passenger side the visor is broken at the swivel arm. All of the small plastic door plugs have fell out. Remote gas tank door will not open on cold days. Vehicle pulls to the right and wheel shakes at speeds 35 and above. Small scratch in paint goes down to the primer.