One problem related to speed sensor has been reported for the 2009 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Hyundai Elantra based on all problems reported for the 2009 Elantra.
I have a consistent problem with shifting gears. This has been going on for a few years. I'll try to take off and it feels like it gets stuck between the lower gears. It causes the car and occupants to get jerked around strongly. A few times it has made it difficult to proceed through an intersection. Hyundai dealer states it is the "speed sensors", but no longer covered under warranty.