Throttle knocking
 

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That's a common error code you can Google.EOBD II Error Code: P2015Fault Location:
Intake Manifold Flap Position Sensor, Bank 1 - Implausible SignalPossible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Power Loss.

Intake Manifold Flap faulty.
Intake Manifold Flap Motor (V157) stuck/faulty.
Broken gears.
Engine Control Module Software/Firmware Version faulty.
Wiring/Connector(s) from/to Intake Manifold Flap Motor (V157) faulty.

Possible Solutions:
Check/Replace Wiring/Connector(s) from/to Intake Manifold Flap Motor (V157).
Check Intake Manifold Flap.
Check/Replace Intake Manifold Flap Motor (V157).
Perform Output Tests/Basic Setting.

Special Notes:
In some Cases the Issue can only be resolved by Replacing the whole Intake Manifold.
The Intake Manifold Flap Motor (V157) and Intake Manifold Tuning Valve Position Sensor (G336) may be Part of the same Unit.
When found in a VW Golf/Jetta (1K): 1.9l PD-TDI (BRM), check Engine Control Module (ECM) Software Version:
03G-906-016-AB @ 7328 or 7550 as well as 03G-906-016-AC @ 7280 or 7551 do have a Software Error which requires a special Adaptation for the Intake Manifold Flap Motor (V157) which at this Point can only be performed with the Factory Tool

https://www.youtube.com/watch?v=s9CeON8FqUU#t=502As

As taken from my new EOBD II Fault Codes Software

@Keithuk Thank you for he reply. Didn't mean to break forum rules on my first thread.
Thank you for the P2015 info. Looks like I am going to need a dealer to look at this. Intake Manifold swap is above my toolbox inventory.
Cheers.