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You had your 1999 Plymouth gran voyager run a computer diagnostics and it came back code unknown what does that mean?
Wiki User
∙ 17y ago
Its most likely a dealer set code telling you you need a tune-up or some other form of regular maintenance. The only way to find out for sure is to take it to a dealer and pay too much money to have it checked. Some codes are programed into the computer to come up at certain mileages and are scrambled by the dealer so it can only be read by their diagnostics reader.
Wiki User
∙ 17y ago
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