P0420 Diagnostic Trouble Code Discussion for September 2005
Catalyst Efficiency Below Normal (Bank 1)
Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.Trouble Ticket Help Requests for DTC P0420
| Help Request | Posted | |
| 1998 BMW 318i 1.9L MIL Lamp on VIN: WBACC0324W P0420: catalyst ineficiency. CUSTOMER HAD CAT REPLACED 18 MONTHS AGO. CODE RESET IMMEDIATELY. wE CLEARED CODES RECENTLY, CODE RESET IMMEDIATELY. wE REPLACED 02 SENSORS TODAY. mY CONCERN IS THE LEAN CONDITION WILL DAMAGE NEW CAT |
September 29, 2005 | |
| 2000 Chevrolet Suburban 1500 LT 5.3L Cuts out, Misfire, MIL Lamp on VIN: 3GNFK16T6Y P0420: Catalyst System Low Efficiency (Bank 1). ... after failing the emissions test due to code: P0420 - low cat efficiency bank 1 - after testing and replacing the catalytic converter and both oxygen sensors (front & rear) on bank 1 the code P0420 low cat efficiency returns - customer has not returned... |
September 29, 2005 |
