hey. I have a 98 a4 1.8T 63,000miles
recently ive been getting a constant tapping sound comming from the engine when im idleing. I scanned with vag and came up with

17965 - Charge Pressure Control : Positive Deviation
P1557 - 35-10 - Intermittent

any ideas?
thanks

 

Btw my mods are a giac chip and a 710n DV.

 

I dont think that code has anything to do with the tapping. The tapping could be your cam chain. The code means you are underboosting, or that the actual boost is less than what the ecu is requesting. Check for boost leaks.

 

i have the same problem primo. It doesnt effect my performance though. From searching around Ive found that its valve timing , or it could be. The tapping gets louder or goes faster as the rpms go up. Does yours?

 

actualy my tapping goes away as the rpm go up