What is relay 109 on vw transporter?

Relay 109 on a VW Transporter is the fuel pump relay. It is responsible for supplying power to the fuel pump, which in turn supplies fuel to the engine. The relay is located in the engine compartment, usually near the battery.

If the fuel pump relay fails, the engine will not be able to receive fuel and will not start. If you suspect that the fuel pump relay is faulty, you can test it by using a multimeter to check for continuity between the terminals. If there is no continuity, the relay is faulty and will need to be replaced.

Here are the steps on how to replace the fuel pump relay on a VW Transporter:

1. Locate the fuel pump relay in the engine compartment.

2. Disconnect the electrical connector from the relay.

3. Remove the relay from its mounting bracket.

4. Install the new relay in the mounting bracket.

5. Reconnect the electrical connector to the relay.

That's it! You have now successfully replaced the fuel pump relay on your VW Transporter.