unable to check engine codes

1998 ford econoline e 150 4.6 v8 206k just purchused for a work truck. the check engine light is on, sometimes flashing. i tried to connect my scanner but it cant see the vechichle. ideas on where to start?

take it to auto zone or advance since the check engine light is on they can hook it up. may just be o-2 you can unplug o-2 see if it makes it run diffirent?

the autozone couldn't check them ether. I went home and discovered a blown fuse. replaced it the pulled my codes and made the repair. it was a loose plugwire.

huh if check engine is on around here they can do it. main thing you got it fixed.