2001 Ford Expedition V8 Two Wheel Drive Automatic 187000 miles
I have a P171 left bank lean code. I had a fuel injection cleaning done and that worked for about 3 days and the light is back on Service Engine Soon. The code is the same. Could you tell me what it could be before I start paying for things I don't need. I have been told it is most likely an O2 sensor. Just looking for a good answer before I take it back to the mechanic.
Monday, October 12th, 2009 AT 8:04 PM