P0421 Diagnostic Trouble Code Discussion for November 2006
Warmup Catalyst Efficiency Low (Bank 1)
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| Help Request | Posted | |
| 2001 Audi Allroad Quattro 2.7L MIL Lamp on VIN: WAUYP54B81 P0421: Warm up catalyst B1 threshold below efficiency. Hey evreybody, This car seems to have no driveability problems just MIL lamp on. I ran through all the VAG block tests via ALLDATA and the block values and self tests all passed. If anybody needs I can get the block values I have obtained. I check the catalyti... |
November 29, 2006 |
