ENGINE CODE LOCATION Note. Illustration for Navajo 4.0L V6, B2300 2.3L 4-Cyl., B3000 3.0L V6 and B4000 4.0L V6 not available. Scheme 1 Log in Scheme 1: ENGINE CODE LOCATION Scheme 2 Log in Scheme 2 Scheme 3 Log in Scheme 3 Scheme 4 Log in Scheme 4 Scheme 5 Log in Scheme 5 Scheme 6 Log in Scheme 6 Scheme 7 Log in Scheme 7