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I have no signal at dianostic port. my scan tool simply says it must be plugedin

(1990 Ford Thunderbird)
in Johnstown, PA on June 19, 2017
scan tool says must be pluged in as if i have no signal at dianostic port. could this be a computer problem? car runs but acts like its in limp mode.
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Popular Answer
on June 19, 2017
Exactly what kind of scan tool you got? .. Where did you find the diagnostic connector at on this 1990 year model? ... We need to establish the correct equipment and procedures are being used first!
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