Check Engine Light on Due to Faulty Catalytic Conveter on Cadillac DeVille DTS

Failure of the catalytic converter can result in illumination of the Check Engine Light.

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Average mileage: 99,252 (58,495–167,070)
5 model years affected: 2001, 2002, 2003, 2004, more2005
12 people reported this problem
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problem details
2003 Cadillac DeVille DTS 122,400 mi,
Check engine light giving 3-4 error codes all related to catalytic converter. Put an after-market catalytic converter on one year ago so car would pass inspection. Now have the same problem. Car won't inspect with current error codes. Heard Magaflow catalytic converter fixes the problem and will last more than one year.
2003 Cadillac DeVille DTS 63,800 mi,
check enigine light stays on steady. Computer code showed inefficient catalytic converter. Expensive replacement.
2001 Cadillac DeVille DTS 86,000 mi,
Check engine light due to faulty catalytic converter
Check engine light on, tech referred me to Cadillac as he claimed catalytic converter needed replacement. Dealer verified and replaced under warranty (8 years/80k miles).