P0491 Diagnostic Trouble Code Discussion for August 2018
Secondary AIR System Insufficient Flow Detected (Bank 1)
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| Help Request | Posted | |
| 2002 BMW 525i 2.5L MIL Lamp on VIN: WBADT43462 P0491: secondary air injection system insufficient flow bank 1. ... with my Autel Mayisys and the Air Pump turns on. I tested fuse 107 50 amp Air Pump under the passenger carpet and its good. I tried a new Air Pump Relay from BMW and still no luck. The connector at the Air Pump is corrosion free too. I've tested all t... |
August 14, 2018 |
