Noise control, air cleaner, ECM, exhaust intermediate pipe

Years 1998–01, 2008–09 Models 4 Factory citations 10

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Also described as Sales region package, market, Europe

Documented applications

DeVille — K-body (1994–1999)

1998–1999 Factory-verified

GM factory document — 1998 cadillac deville rpo code list, p.1.
GM factory document — 1999 cadillac deville rpo code list, p.1.

Eldorado — E-body (1992–2002)

1998–1999 Factory-verified

GM factory document — 1998 cadillac eldorado rpo code list, p.1.
GM factory document — 1999 cadillac eldorado rpo code list, p.1.

Seville — G-body (1998–2004)

1998–2001 Factory-verified

GM factory document — 1998 cadillac seville rpo code list, p.1.
GM factory document — 1999 cadillac seville rpo code list, p.1.
GM factory document — 2000 cadillac seville rpo code list, p.1.
GM factory document — 2001 cadillac seville rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2008–2009 Factory-verified internal

GM factory document — 2008 cadillac srx rpo code list, p.1.
GM factory document — 2009 cadillac srx rpo code list, p.1.

This page aggregates every documented appearance of R1X in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.