FSi P0507 16891 Idle Control System

GTSpec

GTSpec

Member
Hi all,

Does anyone have experience of the P0507/16891 code on their FSi?

The car suffers from an erratic idle when the car warms up. I suspect the throttle unit but would like a second opinion on here.

Recently replaced the N80 EVAP valve for a genuine Bosch unit so that is ruled out.

Thanks.
 

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FYI - The issue ended up being a melted oil filler pipe allowing excess unmetered air into the crankcase. Removed the melted pipe/service hatch oil filler and plugged off the orifice where the melted pipe enters the oil sump. Engine now runs very smooth.
 
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