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The dashboard diagnostic for that year only works with a Detroit engine... it would flash a series of codes via the amber and red engine lights, then you'd have to call it in to decipher it. That's an electronic engine, and you'd need to either hook up a computer with the appropriate software (i.e., DDEC for Detroit, Insite for Cummins, ET for Cat), or use something like a ProLink IQ with an SAE J1708 connector just to read faults. The ProLink can only scan and clear codes, and won't have the full functions of ECM software.

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Q: 1999 freightliner check engine light diagnostic?
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