P0491 Diagnostic Trouble Code Discussion for July 2008
Secondary AIR System Insufficient Flow Detected (Bank 1)
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| Help Request | Posted | |
| 2002 Volkswagen Passat GLX 4 Motion 2.8L MIL Lamp on VIN: WVWTH63B32 P0491: secondary air insufficient bank 1. ... vw passat has reoccuring codes p0491 and p0492 [secondary air insufficient on both banks.]when checking the system everything works properly.the secondary air fan comes on during cold start and runs for about 30 seconds.this means the fuse and relay are go... |
July 31, 2008 |
