Cadillac Deville P Codes (Powertrain) P0400 - P0499 P0420

Browse Cadillac Deville P Codes (Powertrain) P0400 - P0499 P0420 questions and answers. Choose a question that matches your symptoms.

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2004 Cadillac P0420 Code

2004 CADILLAC DEVILLE

"catalyst System Efficiency Below Threshold (bank 1)". Is This Something I Can Repair Myself? I Have Already Changed Out All Sensors...

2 ANSWERS

Asked by pmaspks

2003 CADILLAC DEVILLE

I Have An 03' Cadillac Deville Base Sedan And It Is Throwing The Code P0420 (catalyst System Low Efficiency Bank 1). This Code Just Came Up...

15 ANSWERS

Asked by JaredR123

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