My engine service light came on, and i hook up my Dianostic OBDII and code reads on 2003 Ford Expedition

diagnostic reads PO128, What do I need to do or replace. Thank you KP5205

by in Fayetteville, NC on October 10, 2012
1 answer
ANSWER by , October 10, 2012
thats a low coolant temperature code.your thermostat may be stuck open.i would replace the thermostat.