P0491 Diagnostic Trouble Code Discussion for November 2024
Secondary AIR System Insufficient Flow Detected (Bank 1)
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| Help Request | Posted | |
| 2007 Bentley Continental GT 6.0L MIL Lamp on VIN: SCBCR73W37 P0491: Secondary air injection system bank 1 insufficient flow-lower limit not reached. ... engine light on ( code p0491 secondary air system fault low flow bank 1), scan data group 77/3 data shows -100% on air mass secondary air bank 1/2. Clear code or data 77/3 goes to 0 start car watch data runs at -27% ( air pumps on) shut key off /key on... |
November 11, 2024 | |
| 2021 Volkswagen Passat SE 2.0L MIL Lamp on VIN: 1VWSA7A31M P0491: Air injection insufficient flow. Got this from another shop after they installed a new OEM air pump and lines, we installed a new secondary air pressure sensor, a new check valve at head, cleaned the port through the head and confirmed air escaping through the exhaust, have been fighting ... |
November 14, 2024 | |
| 2021 Volkswagen Passat SE 2.0L MIL Lamp on VIN: 1VWSA7A31M P0491: Air injection insufficient flow. Got this from another shop after they installed a new OEM air pump and lines, we installed a new secondary air pressure sensor, a new check valve at head, cleaned the port through the head and confirmed air escaping through the exhaust, have been fighting ... |
November 18, 2024 |
