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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NB1 Single-source

    Chevrolet · Regular Production Option

    Closed-loop emission control

    Years 1980–81 Models 1
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    Also documented for Buick

    Documented applications

    This page aggregates every documented appearance of NB1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.