Emissions override, California system, federal offset vehicle

Years 1986–93, 1998, 2003–04 Models 3 Factory citations 12

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Also described as Emission system, CaliforniaEmission override, California system, federal

Also documented for Pontiac Saturn

Documented applications

Cavalier — third generation (1995–2005)

2003–2004 Factory-verified internal

GM factory document — 2003 chevrolet cavalier rpo code list, p.1.
GM factory document — 2004 chevrolet cavalier rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Cavalier, p.19.

Corvette — C4 (1984–1996)

1986–1993 Factory-verified internal

the lists call it the California override; the 1985 pages print NNS

GM Heritage factory kit — 1986 Chevrolet Corvette, p.110.
GM Heritage factory kit — 1987 Chevrolet Corvette, p.8.
GM Heritage factory kit — 1988 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1989 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1990 Chevrolet Corvette, p.14.
GM Heritage factory kit — 1991 Chevrolet Corvette, p.10.
GM Heritage factory kit — 1992 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1993 Chevrolet Corvette, p.18.

Corvette — C5 (1997–2004)

1998 Factory-verified internal

GM factory document — 1998 chevrolet corvette rpo code list, p.1.

This page aggregates every documented appearance of NN5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.