2000 Lincoln nav. check engine light comes on. Put on computer, reading 6 differ on 2000 Lincoln Navigator

2000 lincoln nav. check engine light is on. Computer is reading 6 different codes pertaining to o2 sensors, bank 1 and 2, fuel too rich,

Asked by for the 2000 Lincoln Navigator
so...six codes saying it is rich means...it is running rich, so check for possible leaky injector, maf, or cts...