I have a 2000 ford focus se (2.0 Zetec) The car has a rough idle (cold or hot), but runs fine. I have changed spark plugs, wires, air and fuel filter. I have no check engine or other light on. I was wondering if it was the DPFE sensor and if it is how do I know that it is DPFE sensor? What are some of the symptons of a bad DPFE sensor?
