Why isnt it starting

Just the basic tester will only read engine and transmission codes not body control module codes. It takes a advanced expensive scan tool to read body control module codes. So does their basic scan tool power up of the OBD 2 connector? If not you have a blown fuse.

So did the scan tool not power up off your car?

In the underhood fuse box its labeled lighter fuse its a 15amp fuse see if its blown.

That fuse being blown will not cause a car not to start. It will only cause the scan tool not power on and the lighter not to work. You can try getting the code read at the auto parts store but they're not going to be able to tell you any body control module codes.

You said the security light was on solid when it wouldn't start so that would tell me most likely a bad ignition switch. You can check for fuel pressure see what it is.

You can rent a fuel pressure gauge at auto zone also get a noid light also to check for injector pluse. Let me know when you get them and I will give you further instructions.

Sounds like you spun a rod bearing from the lack of oil and now you have a rod knock.

Did they also run there cars out of oil?The balance shaft sprocket doesn't loosen up from no oil. Didn't this noise start after you ran it out of oil?

When you run a engine low or out of oil the first thing that usually happens is the rod bearings start siezing then they break free and start moving in tbe rod between the crank and the rod. Other things happen also but the rods are usually the noisiest. You may have muktiple issues now since the low no oil issues. You can take a long screwdriver to help pin point where the noises are coming from.

Take a long screwriver and touch differenr parts of the engine with the screwdriver up to one of your ears. It always works great for me.