Emission system, general unleaded

Years 2003–07 Models 4 Factory citations 10

Also described as Emission system, general, unleadedEmission system, general, OBD MIL suppressionEmission system, general, OBDII malfunction indicator lamp suppression

Also documented for Cadillac Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

Century — W-body (1997–2005)

2003–2004 Factory-verified internal

GM factory document — 2003 buick century rpo code list, p.1.
GM factory document — 2004 buick century rpo code list, p.1.

Rainier — GMT360 (2004–2007)

2004 Factory-verified internal

the 2005–2007 lists give NF9 another wording, see the next row

GM factory document — 2004 buick rainier 2wd rpo code list, p.1.
2005–2007 Factory-verified internal

the 2004 lists give NF9 another wording, see the previous row

GM factory document — 2005 buick rainier 2wd rpo code list, p.1.
GM factory document — 2007 buick rainier rpo code list, p.1.

Regal — W-body (1997–2004)

2003–2004 Factory-verified internal

GM factory document — 2003 buick regal rpo code list, p.1.
GM factory document — 2004 buick regal rpo code list, p.1.

Terraza — U-body / GMT201 (2005–2007)

2005–2007 Factory-verified internal

the lists read OBD MIL Suppression

GM factory document — 2005 buick terraza rpo code list, p.1.
GM factory document — 2006 buick terraza rpo code list, p.1.
GM factory document — 2007 buick terraza rpo code list, p.1.

This page aggregates every documented appearance of NF9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.