Emission system, California

Years 1984, 1987–92 Models 2

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Also documented for Buick Chevrolet GMC

Documented applications

Fiero (1984–1988)

1987 Confirmed internal

1987 from conceptcarz's 1987 list; the OSG gives no year; the rparts and Halderman lists agree

Firebird — Third generation (1982–1992)

1984, 1987–1992 Single-source internal

; Firebird years: thirdgen.org label decodes 1984; 3rdgenformula option pages 1987–1992

This page aggregates every documented appearance of NB2 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.