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Author Topic: Engine Code P0491  (Read 765 times)

Offline TheBananaMan

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Engine Code P0491
« on: December 27, 2019, 03:07:33 pm »
I daily a bone stock '09 GTI and recently it's been throwing this engine code every time the car starts (which seems atypical based on some posts on other VW forums that I've read this morning). I've inspected the wiring harnesses for the sensors and the relay and those are in tact. The Secondary Air Injection Pump is in working order and there don't appear to be any symptoms aside from the CEL.

The only other thing that I can find that may need to happen is cleaning the intake manifold, cylinder head, and the cylinder head injection ports, which I'm hesitant to do since I'll need to ensure that it's running again by next monday for work as it's my only vehicle and I've never worked on the inside of an engine like that. That and it seems unusual that the injection ports on the cylinder head would be clogged without any noticeable lack of power.


Any other solutions or wisdom is greatly appreciated.