NU4 Factory-verified

Buick · Regular Production Option

Emission system, California, LEV2 plus

Years 2003–07 Models 7 Factory citations 12

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Also described as Emission system, California LEV2 plusEmission system, California, LEV II plus

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.

LaCrosse — W-body / GMX365 (2005–2009)

2005–2006 Factory-verified internal

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

LeSabre — H-body (2000–2005)

2003 Factory-verified internal

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

Park Avenue — G-body (1997–2005)

2003–2005 Factory-verified internal

GM factory document — 2003 buick park avenue rpo code list, p.1.
GM factory document — 2005 buick park avenue rpo code list, p.1.

Rainier — GMT360 (2004–2007)

2004–2007 Factory-verified internal

GM factory document — 2004 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.

Rendezvous — U-body / GMT257 (2002–2007)

2006 Factory-verified internal

GM factory document — 2006 buick rendezvous awd rpo code list, p.1.

This page aggregates every documented appearance of NU4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.