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    1993 explorer 4.0L trouble codes help

    I have the trouble codes 111 for key on engine off. Then the codes after are 117, 21, 81, & 189. Then with engine on it gives me 172 and 136. The 111 is system ok which leads me to the others which are ECT sensor low/grounded; ECT sensor out of range; boost control OR AIRD solenoid; and fuel...