Wow! Its been a long time since Ive been on here. Ok I did a search. Couldnt find what I was lookin for. So I will ask. I bought a 2002 focus 2.0 engine. I have fixed a few problems already by searching on here. Great help!!! But anyway now Im wondering if a collapsed pcv valve hose would also cause the cel light to come on and throw a P0141 code which is the O2 sensor. Just curious is all. Thanks for any help.