Emission system, general unleaded

Years 2003–10 Models 24 Factory citations 89

Also described as Emission system, general, OBD MIL suppressionEmission system, general, unleadedEmission system, federal, NLEVEmissions, general (export)Emission system, general, OBDII malfunction indicator lamp suppression

Also documented for Buick Cadillac GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

Avalanche — GMT800 (2002–2006)

2003–2006 Factory-verified internal

GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified internal

One entry in each of the 2007 and 2008 lists reads general unleaded.

GM factory document — 2007 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Avalanche, p.30.

Blazer — S-10 second generation (1995–2005)

2003–2005 Factory-verified internal

GM factory document — 2003 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2005 chevrolet blazer 4wd rpo code list, p.1.

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 — C5 (1997–2004)

2003–2004 Factory-verified internal

GM factory document — 2003 chevrolet corvette rpo code list, p.1.
GM factory document — 2004 chevrolet corvette rpo code list, p.1.

Corvette — C6 (2005–2013)

2005–2009 Factory-verified internal

GM factory document — 2005 chevrolet corvette rpo code list, p.1.
GM factory document — 2006 chevrolet corvette rpo code list, p.1.
GM factory document — 2007 chevrolet corvette rpo code list, p.1.
GM factory document — 2008 chevrolet corvette rpo code list, p.1.
GM factory document — 2009 chevrolet corvette rpo code list, p.1.
GM Heritage factory kit — 2005 Chevrolet Corvette, p.23.

Express — GMT610 (2003–2027)

2003–2006 Factory-verified internal

; the 2007–2009 lists read general, OBD MIL suppression (another meaning, listed in its own row)

GM factory document — 2003 chevrolet express rpo code list, p.1.
GM factory document — 2004 chevrolet express awd rpo code list, p.1.
GM factory document — 2005 chevrolet express awd rpo code list, p.1.
GM factory document — 2006 chevrolet express rpo code list, p.1.
2007–2010 Factory-verified internal

; the 2003–2006 lists read general, unleaded under the same code

GM factory document — 2007 chevrolet express rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.15.

Impala — eighth generation (2000–2005)

2003–2005 Factory-verified internal

GM factory document — 2003 chevrolet impala rpo code list, p.1.
GM factory document — 2004 chevrolet impala rpo code list, p.1.
GM factory document — 2005 chevrolet impala rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Impala, p.25.
GM Heritage factory kit — 2004 Chevrolet Impala, p.30.

Impala — ninth generation (2006–2016)

2006–2007 Factory-verified internal

GM factory document — 2006 chevrolet impala rpo code list, p.1.
GM factory document — 2007 chevrolet impala rpo code list, p.1.

Malibu — Fifth generation (1997–2005)

2003 Factory-verified internal

GM factory document — 2003 chevrolet malibu rpo code list, p.1.

Malibu — Sixth generation, Epsilon (2004–2008)

2004 Factory-verified internal

the 2004 list prints General Unleaded; GM's other lists read NF9 as OBD MIL suppression.

GM factory document — 2004 chevrolet malibu rpo code list, p.1.

Monte Carlo — sixth generation (2000–2007)

2003–2007 Factory-verified internal

GM factory document — 2003 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2004 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2005 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2006 chevrolet monte carlo rpo code list, p.1.
GM factory document — 2007 chevrolet monte carlo rpo code list, p.1.

S-10 pickup — Second generation (1994–2004)

2003–2004 Factory-verified internal

GM factory document — 2003 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet s10 pickup 4wd rpo code list, p.1.

Silverado — GMT800 (1999–2007)

2003–2007 Factory-verified internal

2003–2004 lists: general unleaded; 2005–2007: general with OBD malfunction-lamp suppression

GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Silverado 1500, p.47.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.60.

Silverado — GMT900 (2007–2013)

2009 Factory-verified internal

GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.

Silverado HD — GMT800 (2001–2007)

2003–2007 Factory-verified internal

2003–2004 lists: general unleaded; 2005–2007: general with OBD malfunction-lamp suppression

GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.

Silverado HD — GMT900 (2007–2014)

2007–2008 Factory-verified internal

GM factory document — 2007 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet silverado 2wd rpo code list, p.1.

Suburban — GMT800 (2000–2006)

2003–2006 Factory-verified internal

GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.39.

Suburban — GMT900 (2007–2014)

2007–2009 Factory-verified internal

One entry in each of the 2007 and 2008 lists reads general unleaded.

GM factory document — 2007 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.34.

Tahoe — GMT800 (2000–2006)

2003–2006 Factory-verified internal

GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.32.

Tahoe — GMT900 (2007–2014)

2007–2009 Factory-verified internal

One entry in each of the 2007 and 2008 lists reads general unleaded.

GM factory document — 2007 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.28.

TrailBlazer — GMT360 (2002–2009)

2003, 2004 Factory-verified internal

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

GM Heritage factory kit — 2004 Chevrolet Trailblazer, p.33.
GM factory document — 2003 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet trailblazer 2wd rpo code list, p.1.
2005–2007 Factory-verified internal

the 2003–2004 lists give NF9 another wording, see the previous row

GM Heritage factory kit — 2007 Chevrolet Trailblazer, p.26.
GM factory document — 2005 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet trailblazer 2wd rpo code list, p.1.

Uplander (2005–2008)

2005–2007 Factory-verified internal

the lists read OBD MIL Suppression

GM factory document — 2005 chevrolet uplander rpo code list, p.1.
GM factory document — 2006 chevrolet uplander rpo code list, p.1.
GM factory document — 2007 chevrolet uplander rpo code list, p.1.

Venture — U-body minivan (1997–2005)

2003–2005 Factory-verified internal

GM factory document — 2003 chevrolet venture ext rpo code list, p.1.
GM factory document — 2004 chevrolet venture ext rpo code list, p.1.
GM factory document — 2005 chevrolet venture ext rpo code list, p.1.

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