Call your dealorship repair shop and ask them or pick up the Haynes or Chiltons guide for your model.
AutoZone can't diagnos vehicles prior to 1996. Go to dealer. Sorry. 1995 Villagers are equiped with OBD I. The diagnostic connector is located in the engine compartment nexy to the starter. As suggested, either go to the dealer or buy a repair manual and try it yourself. AutoZone sells manuals.
Autozone.
try autozone in keyword try autozone in keyword
follow the upper radiator hose down to the thermostat housing- its plugged in on the left side its a 3 pin connector just bought one at autozone for $25
Autozone
if your take it to a autozone tell them you have a check engine light and they will tell you whats wrong if anything and reset it take it to autozone and tell them your check engine light is on and they should reset it
autozone will do it for you for free.
your not giving year ,but should be OBD11 unless 1996 or earlier.There is offered software that plugs into laptop with special harness, but it is pricy, recommend you get OBD11 tester from say Autozone,on sale $ 59.00 to $329.00.
go to autozone .
Autozone or Advance parts
take it to autozone and have it scanned
go to autozone or advaced and ask for some seafoam