Toyota Sienna multiple system malfunctions including lane departure alert, cruise control, and pre-collision system reoccurring after dealer fix on Toyota Sienna

Some Toyota Sienna owners report experiencing persistent system malfunctions, including issues with lane departure alert, cruise control, and the pre-collision system, even after dealer repairs. These problems are often indicated by warning lights such as "Pre-Collision system malfunction" and "Lane departure alert malfunction," which signal potential safety feature failures. Ignoring these warnings can increase the risk of accidents, as these systems are crucial for enhancing safety. The Toyota Pre-Collision System (PCS) relies on radar and cameras to detect potential collisions and initiate automatic braking, making its proper function vital. Owners may find diagnostic trouble codes associated with PCS malfunctions that require attention. To address these issues, some owners have had success by resetting the vehicle, recalibrating the system, inspecting sensors, and cleaning the area around the front-facing camera. If problems continue after dealer intervention, it may be necessary to revisit the diagnostic process, ensure proper sensor calibration, and seek further assistance to resolve these ongoing malfunctions.