I just picked up a 2000 C70 with 17500 km on it. Was a theft recovery that sat in a sea container for 2-3 years. Test drove car and no signs of trouble. Drover her home and about 120 km later check engine light is on. Had a buddy use a reader and it waas P1171. Clearded it and was ok for a day. Next code was for misfire on c1 so we changed all 5 plugs. 10 km later the P1171 comes back on.ChangedO2,P1171 within 150 km. My guess is Mass Air Flow? Any otherreasonable quesses?
Thanks in advance....

 

I was told it is the oxygen sensors. I think there are two front and rear.

 

Could very well be a bad MAF.