U09 ✓ Factory-verified

Buick · Regular Production Option

Horn, four note

Years 1998–99 Models 1 Factory citations 2

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Also documented for Cadillac

Documented applications

Park Avenue — G-body (1997–2005) →

• 1998–1999 ✓ Factory-verified
  ⛭ GM factory document — 1998 buick park avenue rpo code list, p.1.

  ⛭ GM factory document — 1999 buick park avenue rpo code list, p.1.

This page aggregates every documented appearance of U09 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.