One problem related to speed sensor has been reported for the 2006 Nissan Maxima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Maxima based on all problems reported for the 2006 Maxima.
I was driving my car at 40 mph in light rain. As I approached a red light, I lightly got on the brakes. Immediately, the abs kicked in. The amount of braking force was well below the margin where abs should kick in. Thinking it was a onetime deal, I drove cautiously and tried braking again. This abs again kicked in immediately. The abs kicking in did lengthen the stopping distance as I was not applying the brakes hard enough to effectively slow down. On the next attempt, acceleration, traction control kicked in upon acceleration, causing the car to shake violently. My car was taken to the shop where the right rear wheel speed sensor had build up on it. Checking forums about my car, this was a common occurrence and seems to be a design flaw. Under different circumstances, a collision could have resulted due to the issue. Nissan has a service bulletin for this issue, but in my eyes, this issue is should be a investigated further as control of vehicle speed is compromised.