P0491 Diagnostic Trouble Code Discussion for March 2023
Secondary AIR System Insufficient Flow Detected (Bank 1)
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| Help Request | Posted | |
| 2018 Volkswagen Tiguan SE 2.0L MIL Lamp on VIN: 3VV2B7AX7J P0491: secondary air insufficient flow. ... a 2.0 liter turbo. This is the first time we have serviced this vehicle, so we don't have any history on it. It came in with a P0491 code that we diagnosed as having a sticking check valve, which was very carboned up and dirty. We did test the output o... |
March 15, 2023 | |
| 2019 Volkswagen Tiguan SE 2.0L MIL Lamp on VIN: 3VV0B7AX9K P0491: secondary air insufficient flow bank 1. customer came in with this vw . went through most of it - air pump works and switching valve makes loud audible noise when switching . pressure sensor rises with pump on and valve closed. suggested customer go to dealer as at the time it was just 900 miles... |
March 27, 2023 |
