P0421 Diagnostic Trouble Code Discussion for August 2004
Warmup Catalyst Efficiency Low (Bank 1)
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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 | |
| 2000 Audi A6 Quattro Avant 2.8L MIL Lamp on VIN: WAULH64B7Y P0421: 16805 primary catalytic converter efficiency bank 1. ... bang on the highway the "CHECK ENGINE" light came on. I do not associated any of these codes with a bang. Reset codes. Ran road tests without a fault. Can find no information on P1376. Help. |
August 20, 2004 |
