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  • Chatter on acceleration
  • Sluggish acceleration


A cracked or broken adjustable end plug at the thin walled section below the external thread.


Installing the Sonnax UV adjustable end plug with improved design and thicker walls correct these concerns and reduces possibility of future failure.

01J, 01T

UV Adjustable End Plug
Part No. 33741B-10

You need this if... View Instructions

In Audi 01J and 01T units the adjustable end plug capping the UV reduction valve bore is often cracked or broken. The failure occurs at the thin-walled section below the external thread root. The Sonnax UV adjustable end plug 33741B-10 is designed with a thicker wall to eliminate this type of failure.

  • Improved design reduces possibility of similar failure
  • Simple thread-in replacement

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Audi 01J Valve Body Layout

Vw audi 01j vbl

Audi 01T Valve Body Layout

Vw audi 01t vbl
  • 33741b 10 combo
  • 33741b 10
  • 33741b 10 measure  3

You need this if...

OE adjustable end plug is cracked or broken.