OE Part Number: 1J0906381A|
Manufacturer's Part Number: 1J0906381A
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.