Originally posted by brapple:
well the only other thing I can think of is there is unmetered air getting into the system, on the V6 you would get the lean code for both banks, but since its a Zetec then maybe this is what it is if the O2 sensor is working fine



I could have sworn that my mothers 99 threw a 171 and we replaced the O2 sensor but I am not sure as it was awhile ago



So your thinking the intake manifold gasket?

I did think that for a while to, but after searching some people have said that there idle isnt right, it goes up and down (if I read it correctly). My idle is fine.

I have to find that PCV valve hose, does anyone have a photo of it?

Also while reading www.carsurvey.com many people have said their CEL is always wrong and that it meant nothing because nothing was wrong with the car, it was just giving out a false code, do you think that could be possible?

thanks for any help

By the way 190 miles on half a tank of gas currently, so whatever it is isnt effecting my mileage much.