General Motors option code

NG1

NG1: a General Motors factory option code reused for more than one part across 1994–2002 and 2 models — see the table for what it named each year, with installs and price where a source states them.

General Motors reused this code for more than one part over the years — read the "as named that year" column for what it meant on each row rather than assuming one meaning throughout.

2 models · 3 model years · 1 source

Dark Cherry Metallic 1995 Chevrolet Impala SS four-door sedan at an outdoor car show, front three-quarter, with red-outlined bowtie and Impala emblem on the rear pillar — Shown: 1995 Chevrolet Impala SS sedan in Dark Cherry Metallic Photo: Calreyn88, CC BY-SA 4.0, via Wikimedia Commons

Every sourced appearance

Year	Model	As named that year	Price	Installs
1994	Chevrolet Impala SS	New York State emission requirements RPO	Unknown	Unknown
1995	Chevrolet Impala SS	Massachusetts emission requirements RPO	Unknown	Unknown
2002	Pontiac Firebird and Trans Am	Northeast emissions system RPO	Unknown	2,018 Reported

Every row traces to the source it links from on that model's own year page; this table only collects them in one place.