NB6 ✓ Factory-verified

Buick · Regular Production Option

Emission system, California, Tier 1

Years 1998 Models 5 Factory citations 5

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Also documented for CadillacChevroletGMCOldsmobilePontiac

Documented applications

Century — W-body (1997–2005) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 buick century rpo code list, p.1.

LeSabre — H-body (1992–1999) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 buick lesabre rpo code list, p.1.

Park Avenue — G-body (1997–2005) →

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

Regal — W-body (1997–2004) →

• 1998 ✓ Factory-verified internal
  ⛭ GM factory document — 1998 buick regal rpo code list, p.1.

Riviera — G-body (1995–1999) →

• 1998 ✓ Factory-verified internal

  the list prints Tier1

  ⛭ GM factory document — 1998 buick riviera rpo code list, p.1.

This page aggregates every documented appearance of NB6 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.