NT4 ✓ Factory-verified

Cadillac · Regular Production Option

Emission system, EEC 05

Years 2005–09 Models 7 Factory citations 14

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Also documented for BuickChevroletGMCHummerPontiacSaturn

Documented applications

CTS — Sigma II (2008–2015) →

• 2008–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2008 cadillac cts rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac cts rpo code list, p.1.

CTS — Sigma / GMX320 (2003–2007) →

• 2005–2007 ✓ Factory-verified internal
  ⛭ GM factory document — 2005 cadillac cts rpo code list, p.1.

  ⛭ GM factory document — 2007 cadillac cts rpo code list, p.1.

Escalade EXT — GMT900 (2007–2013) →

• 2007–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2007 cadillac escalade ext rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac escalade ext rpo code list, p.1.

Escalade — GMT900 (2007–2014) →

• 2007–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2007 cadillac escalade rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac escalade rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009) →

• 2005–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2005 cadillac srx rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac srx rpo code list, p.1.

STS — Sigma (2005–2011) →

• 2005–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2005 cadillac sts rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac sts rpo code list, p.1.

XLR — Y-body (2004–2009) →

• 2006–2009 ✓ Factory-verified internal
  ⛭ GM factory document — 2006 cadillac xlr rpo code list, p.1.

  ⛭ GM factory document — 2009 cadillac xlr rpo code list, p.1.

This page aggregates every documented appearance of NT4 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.