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  1. Problem codes ??

    Drivetrain Tech Center
    I have a 1996 ZJ limited 4.0 Quadratrack, Just today i was driving along and the check engine light came on but i didnt see or feel anything wrong so i pulled over and turned the key to bring up the codes and i got 21 and 37, and everywhere i look i get 14 different explanations as to what each...