Does anyone know how many o2 sensors a 2002 sport fail has ? Its a 4wd truck. Ive been told it has 4 but i only have 3 . When i got the shit bucket ,it had a mustang motor in it . It blew up because of lean conditions...ive never been able to solve it to this day. Ive replace the fuel pump twice ,o2 sensors , intake and gaskets . Pulsed the injectors , fuel pressure 65 , smoke tested , clean maf and replaced , new fuel , filter and have been at it with forscan trying to figure out this german shit bucket. Im wondering if the ECU is bad ....im getting ready to put a 5.0 in it (not the fun one) the old pushrod lmao. Any help would be awesome. Im thinking it should have 4 o2 sensors and the dude used a mustang harness with it ?