2001 Ford TaurusSeptember 20, 2011September 21, 2011Recently fixed cylinder1 misfire. Still showing P0171 & P0174 codes.How do I fix this? Share Tweet Pinterest Keywords:EGRMisfireP0171P0174P0300Taurusvacuum leak 1 thought on “2001 Ford Taurus” Freeautomechanic September 21, 2011 at 6:34 am These codes are almost always an indication of a vacuum leak. On Fords the most common areas to check are the PCV valve and the EGR valve. Comments are closed.