Yepper! Da OBDII device and app will give ya da engine error code(s) (wid da capability to reset 'em) and guide ya to on-line diagnosis/explanations/solutions.
BTW, think da OBDII format started 'round 1996...
KIM, ya may get multiple possible solutions. But most errors are quite specific as to da guilty/faulty automotive component.
My first aggravatin' code had several 'solutions'. But da most common remedy was da cheape$t and worked, gas cap: victory (tired ol' pressure relief spring). My latest code indicated a faulty Coolant Temperature Sensor. Dat was a 'no brainer' in dat da app indicated a -40° F coolant temp to da 'puter (no way 'round here!). Note, fer my vehicle, da CTS goes to da 'puter and dere's a diff sensor fer da dashboard temp gauge.
Bottom line, fer <$11, a free app and on-line sources, if ya got an annoying beacon, go fer it! I'll entertain any questions within my limited knowledge.
Honestly, I don't know how much dis lil' <$11 device $aved me by avoidin' dealerships. But I know it ha$!
KIM, although I've paid my dues as a shade tree auto enthusiast waaay back when, I no longer can afford today's specialty diagnostic equipment.
OBTW, d/l da app and just do a lil' crusin' to check out da possibilities...
Day-um, sorry fer da extended post!