Engine is leaking after overheating and stopping on the freeway - there is also water in the oil. seems to be leaking from the bottom of the engine - maybe a blown seal? what does this mean repair wise?

sounds like the frost plug(freeze plug)let go and needs to be replaced. may have overheated the motor and it stopped due to overheating, as you say it was running and then just stopped and won`t start. just so you know the right side of the motor is the side facing the radiator as the pulleys face the drivers side. this is how a tech differentiates left from right on a Honda. fill with the proper anti-freeze and water mixture. this is all the help I can give you with the information you have supplied.

You may have a blown engine head gasket. Check your oil to see if it is milky because water is getting into the oil, and check the water to see if oil is getting into the coolant.
If you have either of these, you may need to have a new head gasket for the engine, and hopefully you do not have a cracked engine head.
This will require a fair bit of work to fix correctly. Your local garage or mechanic may be your next call.
There are some products you can use in the coolant for either of these, but it is only a temporary fix.

COULD BE THERMOSTAT IF TOP RADIATOR HOSE IS NOT HOT AND BOTTOM RADIATOR HOSE GOING TO WATER PUMP IS HOT THE THERMOSTAT STICKING PARTIALLY CLOSE.IF TOP HOSE IS HOT THE RADIATOR,ENGINE BLOCK HEATER CORE NEED FLUSHING OUT.IF WATER PUMP WEEP HOLE LEAKING REPLACE WATER PUMP, FAULTY WATER PUMP WILL CAUSE ENGINE TO OVER HEAT.REPLACE RADIATOR CAP MAKE SURE YOU HAVE 50 / 50 MIX SOLUTION ANTIFREEZE AND WATER IN COOLANT SYSTEM. IF ALL LOOKS GOOD CHECK ENGINE OIL ON DIP STICK, IF OIL IN DIP STICK LOOK LIKE MILKSHAKE YOU HAVE BLOWED HEAD GASKET THAT WILL CAUSE ENGINE OVERHEATING WHILE DRIVING CAR IN SHORT DISTANCE AND ENGINE OVERHEATING.

check for a blown head gasket, do a compression test on all the cylinders, they should all check out to about the same , if 2 are off you have a bad gasket

Need to seal the leak in the coolant container with epoxy or by replacing the coolant container.

Fill coolant system with 50/50 solution up to 2 gallons may be required to stop the overheating.

Don't drive an overheated engine.

Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

if it is a 2.7 check the oil dipstick for sign of coolant in oil will looks like chocolate milk, also inspect wip hole on left bottom front side of engine there is a hole if wet or sign of red fluid possible water pump's leaking do not delay in replacing pump, it can damage engine, tell me where or what area of engine do you see coolant, this vehicle used orange 5 years protection coolant. let me know

First find exactly where the water comes from.
broken hose or hole in radiator - if no leaks here then :-
broken / loose drive belt to water pump - sign is no heat to internal heater
thermostat stuck - heats up and overheats quickly. water from exits rad cap area
also check radiator cap - should be sprung to contain water under pressure, usually these are very reliable

check oil filler cap [inside of] - should be oily and grey/black If it has a covering of what looks like soft brown aireated jelly then possibly hear gasket or other internal engine leak between water & oil ways. The excess pressure from engine will force water out of rad cap area . A compression test with variable readings for between cylinders will confirm this. Hope its not this. It's expensive