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: 122,962 (65,000–220,000)
6 model years affected: 2000, 2001, 2002, 2003, more2004, 2005
31 people reported this problem
11 people shared problem details
2002 Cadillac DeVille130,000
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 DeVille160,000
code. used treatment with "seafoam" engine spray and lube $10 vs $300 after market converter or 1000 oem
2004 Cadillac DeVille119,787
Cat failure. Replaced Cat and less than 2 months later the Cat failed again
2005 Cadillac DeVille144,000
need new catalytic converter
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 DeVille166,500
Check engine light came on and coded that it was an issue with the Catalytic Converter. Totally sucks.
2000 Cadillac DeVille220,000
Insalled Walker catalytic converter, $128.00 on Ebay. 6 weeks ago...still good
2005 Cadillac DeVille175,000
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.
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.
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