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

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

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Average mileage: 125,168 (65,000–220,000)
6 model years affected: 2000, 2001, 2002, 2003, more2004, 2005
33 people reported this problem
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Viewing 1 - 11 of 11 problem details
2002 Cadillac DeVille 130,000 mi,
Check Engine Light on due to catalytic converter
Right after I bought the car the check engine light came on so I am not sure when it actually started. I bought it second hand. i have not fixed it.
2002 Cadillac DeVille 160,000 mi,
code. used treatment with "seafoam" engine spray and lube $10 vs $300 after market converter or 1000 oem
2004 Cadillac DeVille 119,787 mi,
Cat failure. Replaced Cat and less than 2 months later the Cat failed again
2005 Cadillac DeVille 144,000 mi,
need new catalytic converter
2005 Cadillac DeVille 175,000 mi,
I had light on CHECK ENGIN went to local Cadillac Dealer and was informed it was the CAT.Con. and I required a new one @ 3667.00 plus labour so I went to a well known muffler shop here in Kelowna,B.C. Canada and had a generic one installed for 350.00 inc. tax.labour and productand it runs just fine now / I was an un:suspecting buyer it had been a taxi in Culver city Ca. sold to a cab. in Nevada / and mills were rolled back to 50.000 miles/ I got all this info after I bought it from car fax ?? / I paid 7200.00 and spent about 3000.00 but it runs like a charm now / but get a used car checked befor you buy I never would have bought a used taxi/limo.
2002 Cadillac DeVille 72,000 mi,
replaced catalytic converter a few days latter light came on again. replaced sensor, light came on again. mechanic said needs to be programed.
Ruff idle shinning sound vibration miss fire changed coil pack and spark plugs same problem persists
2002 Cadillac DeVille 166,500 mi,
Check engine light came on and coded that it was an issue with the Catalytic Converter. Totally sucks.
2000 Cadillac DeVille 220,000 mi,
Insalled Walker catalytic converter, $128.00 on Ebay. 6 weeks ago...still good
2002 Cadillac DeVille 70,000 mi,
Just out of the 6 year / 100K certified warranty. It cost me over $1000.00 to repair. I was told this is because engine oil consumptiom burns them out.