A faulty Vehicle Speed Sensor would result in the speedometer not working, the CEL to indicae and the D4 to flash.
Testing can be done with the aid of a DVOM but this item is prone to give way quite often and if you wish to elimate the process of troubleshooting, replace the VSS which can be done easily.
Before that, check to ensure the VSS wires are good and plugged in securely. Item is located under the thermostat housing, on top of transaxle. Removing the air cleaner hose would allow you easier access.
Friday, May 7th, 2010 AT 4:21 PM