P0491 – VOLKSWAGEN

Code : P0491
Make : VOLKSWAGEN
Description : P0491 VOLKSWAGEN Secondary Air Injection System Insufficient Flow Bank 1
Possible causes :
– Intake leak
– Damaged AIR system components
– Faulty AIR Solenoid Valve
– Faulty AIR system relay
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top
Scroll to Top