BUICK PARK AVENUE OBD1 CODES CODE 26

I Am Getting A Code 26 And 41 For My Car. Code 26 Seems To Be A Quad Driver Module Error (qdm A Error). What Are The Steps To Determine The...

What Are Trouble Codes 26, 58 For A 1993 Buick Park Av And How Do I Clear Them. I Think Its About The Transmission But Not Sure