P0421 Diagnostic Trouble Code Discussion for December 2006
Warmup Catalyst Efficiency Low (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 P0421
| Help Request | Posted | |
| 2001 Audi A6 Quattro 2.7L MIL Lamp on VIN: WAUED64B11 P0421: warmup cat efficiency b1. Hello folks in iatn land. I need some help with this one.I know this car needs a t stat but i see no problem with the air system. I have 15in of vac at the valves. Ihave good air pump preasure and vol. And I have good flow through the heads. I did check the re... |
December 19, 2006 |
