Starts an runs just for a few seconds

Hello,

Can I ask if the security light is flashing when you try to start the engine? If so this guide will help reset it:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Does the engine have spark this guide will help:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please run down these guides and report back.

there is no guides to go by?

Did you click the links above?

on the 2002 Subaru Outback 3.0 the crank senor is it located on top of the bell housing because it`s not under alternator?

Here is the location of the crankshaft sensor and the instructions on how to replace it in the diagrams below. Check out the diagrams (below). Please let us know what happens.