Emission system, federal

Years 1986, 1989–91 Models 2 Factory citations 5

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Also described as Emissions, standard

Also documented for Buick Chevrolet GMC Oldsmobile

Documented applications

6000 — A-body (1982–1991)

1989 Single-source internal

the 1989 order guide lists it as a must-order emissions choice; shared A-body code; cited from the Chevrolet Celebrity kits; no 6000 source names it, so the row rests on the kit pages alone

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

Firebird — Third generation (1982–1992)

1986, 1989–1991 Factory-verified internal

; camaro-gen3 reads a standard emission system; this row follows the Firebird sources: the 1986 label decode and 3rdgenformula read federal emissions; Firebird years: thirdgen.org label decodes 1986; 3rdgenformula option pages 1989–1991; shared F-body code; cited from the Camaro kits

GM Heritage factory kit — 1986 Chevrolet Camaro, p.39.
GM Heritage factory kit — 1989 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1990 Chevrolet Camaro, p.37.
GM Heritage factory kit — 1991 Chevrolet Camaro, p.31.

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