EFI light has been on for a few weeks. Seems sluggish, Checked fuel filter on bottom of pump and changed it. Just changed oil/filter and there is fuel in the oil. I read could be a leaking fuel injector - how do I check fuel injectors for leaks on a 4010 Kawasaki Mule?

anyone

On cars, we'd hook up a fuel pressure gauge and cycle the key a few times to build pressure. Then watch the gauge with the key off. Not sure if you have a gauge or if there is even a way to hook one up to that engine.

Another option is to pop the injectors out, still hooked up to the fuel supply, and watch for drips coming of of the injector.

Get a can of Injector Cleaner (SeaFoam) and do a heavy dose - you likely have a dirty/stuck injector. For $10.00 your problem could be solved - if not cleaning the rest of your fuel system is a good thing.
Is this motor a direct injection EFI?

Watching...just in case. I own the same machine.

Moosetrot

X2 This is Sea-Foam double strength. Chem-Tool for fast clean-up and Sea Foam for year around maintenance. Well worth the money since today gas is mostly junk.

I never checked them before. Might want to price a factory manual. Might be cheaper than taking to a dealer if u r able to do the work.