Car Problem Reports

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

Cadillac DeVille DTS Problem
12 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005

Average Mileage: 99,252 mi (58,495 mi - 167,070 mi)


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

  • Visitor, , 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.

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  • Visitor, , 63,800 mi

    check enigine light stays on steady. Computer code showed inefficient catalytic converter. Expensive replacement.

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  • Visitor, , 86,000 mi

    Check engine light due to faulty catalytic converter

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  •  Enthusiast

    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).

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