Scion xD rough idling, shaking, multiple warning lights, and speedometer malfunction despite extensive repairs on Scion xD

Some Scion xD owners report experiencing rough idling and shaking at red lights, which may be attributed to vacuum leaks, dirty throttle bodies or MAF sensors, faulty spark plugs, low fuel pressure, or compression issues. Additionally, some owners note that shaking during idle could stem from misfires or bad motor mounts. Furthermore, multiple warning lights, including those for power steering, wipers, HVAC, and other systems, may illuminate, suggesting a potential electrical issue affecting the vehicle. Owners have also reported speedometer malfunctions, often linked to problems with the speed sensor, wiring, or the instrument cluster. Despite extensive repairs, if these symptoms persist, it is advisable to conduct a thorough diagnostic check and consult a qualified mechanic or dealership to ensure all issues are accurately identified and resolved, as prompt attention is crucial for maintaining vehicle safety and performance.