Does the engine need to be running in order to get any useful information from an OBD?

I have an engine that will not start and am willing to buy a cheap OBD if there is a chance that it will help me.

Alan

 

The engine does not have to run for a scanner to pull Diagnostic Trouble Codes and Inspection/Maintenance Monitors. Turn the ignition key to the ON position.

If you don't have a current check engine light then there may not be a code to display (although there could be a pending code).

Have you read a basic article on troubleshooting a car that won't start?
Troubleshooting a Car That Won't Start - For Dummies
(ignore the website name)

 

Thanx, that's what I was hoping.