Part number 06F109088 is an Intake Camshaft Adjuster Actuator (also known as a Variable Valve Timing (VVT) Phaser or Sprocket) used in Volkswagen Group vehicles. 

Core Function

• This component is part of the engine's timing system. It uses oil pressure to adjust the position of the intake camshaft relative to the crankshaft, optimizing valve timing for improved fuel economy and engine performance across different RPM ranges. 

Vehicle Compatibility

It is primarily designed for 2.0L FSI and TFSI (BPY engine code) engines found in the following models: 

• Audi: A3 (2005–2008), A4/A4 Quattro (2005–2009), TT (2007–2010), and TT Quattro (2009–2015).
• Volkswagen: Golf/GTI (2006–2008), Jetta (2006–2008), Passat (2006–2008), Eos (2007–2010), and Golf R (2012–2013).
• Other Brands: Various SEAT and Škoda models using the same 2.0T engine platform. 
• Technical Specifications
• Location: Intake side of the valvetrain.
• Interchangeable Part Numbers: 06F109088J, 06F109088C, 06F109088G, and 06F109088B.
• Common Manufacturers: Genuine VW/Audi, Febi Bilstein, and INA. 

Common Failure Symptoms

• When this unit fails, you may experience:
• A loud "rattling" or "clacking" noise from the timing cover area at idle.
• Check Engine Light (CEL) with codes related to camshaft position (e.g., P0011 or P000A).
• Reduced engine power or rough idling.