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.
Keep a spare in your glove box
Relay 109 ALH TDI
$19.99Price
Fit's
Volkswagen TDI
- New Beetle TDI (A4 chassis) w/ ALH Engine (1998-2003)
- Golf TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
- Jetta TDI MkIV (A4 chassis) w/ ALH Engine (1999-2003)
- Jetta Wagon TDI (A4 chassis) w/ ALH Engine (2002-2003)