One problem related to brake antilock wheel speed sensor has been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
The contact owns a 2004 Toyota Sienna. While driving approximately 5 mph a slip control alarm began to sound and the rear brakes locked. During the failure a slip control light also began illuminating on the instrument panel. The vehicle was towed to an independent mechanic who stated that there was rust developing on a spindle near the front driver's side speed sensor. The front driver's side speed sensor was replaced and the rust was cleaned from the spindle. The failure continued to occur. The failure and current mileages were 94,900. The VIN was unavailable.