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a/c fault code 4-1-8 850 1993

hi initially had fault code 4-1-9 , ecc power stage emiting faulty diagnostic signal, and on advise, replaced fan and power stage, 4-1-9 dtc now clears, but i have a new dtc, 4-1-8, no control signal to ecc power stage, just hopeing someone has some clues for me, thanks, joe.






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