P0491 Diagnostic Trouble Code Discussion for February 2026
Secondary AIR System Insufficient Flow Detected (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 P0491
| Help Request | Posted | |
| 2012 Volkswagen Golf 2.5L MIL Lamp on VIN: WVWBB7AJ3C P0491: secondary air injection insufficient flow. ... emissions test and the check engine light was on. P0491-Secondary AIR injection insufficient Flow. Checked AIR pump and inspected line between pump and AIR solenoid valve. No problems. Checked AIR solenoid valve and found it was sticking. Replaced val... |
February 07, 2026 |
