P0420 Diagnostic Trouble Code Discussion for August 2012
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 | |
| 2004 Chevrolet Trailblazer LS 4.2L Surge VIN: 1GNDS13S74 P0420: Catalyst System Low Efficiency (Bank 1). this vehicle has a slight surge at all times except at idle. the surge is about 50 rpms. it has a bad catalyst convertor. the rear 02 is switching with the front one. the surge seems to follow fuel trim & o2 sensor numbers. i unpluged rear 02 sensor & ... |
August 14, 2012 | |
| 2003 Dodge Neon SXT 2.0L Stall VIN: 1B3ES56C83 P0420: Catalyst Efficiency Below Normal (Bank 1). This car has been in every shop in town. It is a rebuilt wreck. It stalls intermittantly after first starting. About the time you pull out of the driveway and start to take off. It has had a used computer installed, new O2 sensor, new CMP sensor, transmission ... |
August 30, 2012 |
