I have a used 1995 Infiniti J30 and the check engine turns on and off all the time. What should I do?

take it to a repair facility at least to habe it scanned for trouble codes

go to your auto part store, they check your codes for free

Check your exhaust system, specifically the catalytic converter. If there is a leak problem there, that is what would result. It would be like a hole in the pipe or converter, not necessarily a actual failure.

Take it to an auto shop that will give you a free diagnostics test. They hook up a machine to your car and can tell exactly whats wrong with it, if anything. Also make sure you screw your gas cap on really good. l know my car dealership told me if l didnt screw the cap on good it would put my check engine light on

open the dashboard cluster panel and take out the light that is on..make sure it says check engine..my friend use to have a srs light come on his ford and he took his out passed inspection like new..former used car dealer 12 years

try going to a auto parts store most have a tool that checks
the engine light and can tell you for free whats wrong,,
could could be the o2 sensor before or after your cat converter my car has three but the can tell you whats up..
oh by the way for my benz they are 144.00 up not installed..

take it to a Infinity dealer

take it to a shop and they will check it

Only a Dealer can fix this. If the car is running OK, just ignore it.

Engine lights only come on on this year car if a sensor is open or shorted, so there is a problem that needs to be fixed. Dealer is expensive but they will get it right the first time. Independent shops usually seem cheaper until you have to fix it over and over again. Also dealers know the car inside and out and will look your car over top to bottom and advise you of any further problems.

If it is a vapor loss the light will shut off after so many start cycles and is caused by a bad gas cap. Give the cap a-little more clicks tight to test, if not O2 sensor but most of the time the light will stay on.