Engine, gas, 6 cylinder, 3.5L, sequential fuel injection, V6, GM

Years 2005–07 Models 2 Factory citations 5

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Also documented for Chevrolet Pontiac Saturn

Documented applications

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

2006–2007 Factory-verified

The 3.5 L V6 replaced the 3.4 L in 2006 (Wikipedia). The 2007 list is the front-wheel-drive list only. Shared U-body code; Chevrolet Uplander 2006 kit.

GM factory document — 2006 buick rendezvous awd rpo code list, p.1.
GM factory document — 2007 buick rendezvous fwd rpo code list, p.1.
GM Heritage factory kit — 2006 Chevrolet Uplander, p.100.

Terraza — U-body / GMT201 (2005–2007)

2005–2006 Factory-verified

3.5 L V6 (Wikipedia, which gives the engine for 2005 and says it was discontinued in 2006; the 2006 list still prints it)

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

This page aggregates every documented appearance of LX9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.