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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NA5 Single-source

    Buick · Regular Production Option

    Federal emissions

    Years 1985, 1989 Models 1 Factory citations 1
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    Also documented for ChevroletGMCOldsmobilePontiac

    Documented applications

    Century — A-body (1982–1996)
    • 1985, 1989 Single-source internal

      1985 from the parts catalog; 1989 from the Chevrolet Celebrity kit's order guide, which calls it standard emissions (a shared A-body emissions code)

      GM Heritage factory kit — 1989 Chevrolet Celebrity, p.10.

    This page aggregates every documented appearance of NA5 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.