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Relay 109 is the main power supply relay for A3/B4, and A4 TDIs with the ALH engine. When it fails the engine will crank but not start. Sometimes they fail intermittently.

Most TDI owners like to keep a spare in their glove box.

Sold individually, two are pictured to show both sides of the relay.

In Stock
Volkswagen
  • Golf TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
  • Golf TDI MkIV (A4 chassis) w/ BEW Engine (2004-2006)
  • Jetta TDI MkIII (A3 chassis) w/ AHU Engine (1997-1999)
  • Jetta TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
  • Jetta TDI MkIV (A4 chassis) w/ BEW Engine (2004-2005)
  • Jetta Wagon TDI (A4 chassis) w/ BEW Engine (2006)
  • New Beetle TDI (A4 chassis) w/ ALH Engine (1998-2003)
  • New Beetle TDI (A4 chassis) w/ BEW Engine (2004-2006)
  • Passat TDI (B4 chassis) w/ AHU/1Z Engine (1996-1997)

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