What It Is
Relay 109, made by Meistersatz, for Mk3, B4, and Mk4 TDI platforms.
Why This Relay Matters
Relay 109 handles the main power supply to the engine. If it fails, the car simply won't start, since the engine has no power to run. Many owners keep a spare in the glove box specifically because a failure leaves the car immobilized with no warning.
Fitment
Mk3, B4, and Mk4 TDI platforms.
Common Questions
What happens if Relay 109 fails?
The engine won't start at all, since this relay supplies its main power.
Should I keep a spare on hand?
Many owners do, since a failure can leave the car stranded without warning, and a spare relay is a quick fix if it happens.
Is this a genuine OEM part?
It's made by Meistersatz, matching OEM part number 1J0906381A.
