I did the bypass that is common place now on our engines some time last year, Everything felt good, The car still drives fine, But due to my boost going a little higher than before i decided to vag com the car last week, I have one fault code... 17608 Boost Preasure Control Valve N249 mechanical malfunction intermittent. I cleared the code as the valve is still plugged in but no longer piped up... This morning a rechecked the codes on my way to work... its back again ! If the valve is plugged in but not plumbed in how can the ecu tell it isnt working ? I used my spare N249 as i removed and kept all the old pipe work complete and as one piece, Is the code that the N249 itself is faulty ? or that the car knows it isnt doing its job any longer??