Not many options w/obd2
Battery disconnect [ don't forget radio code- ]
the OBD1 systems are nice for DIYers BC you can make a $5 tool [ and some even have the tool built-in under the hood], but those days are gone...
There again, OBD2 has so much more info..
I guess a Computer interface and/or scanner may not be a bad idea for those inclined..
They tell me Auto-Zoney does it for free..
A PS on your plastic vac line , et al..
This line is a Common [ shared] vac source feed to both the EGR AND AIR SOVs, so you can see where you can get double problems with a cracked one..[ and they ALL crack..I replace the entire line w/good rubber one]