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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.
Fixed my issue with not starting. Engine would crank but no fire. Also noticed no glow plug light. Replaced this relay, fired right up. 2000 5speed alh Jetta.
Bought as a spare and have not used
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