I overheated my 93 Loyale and the dealer code pull (check engine light) came back with codes 21 Temp sensor, Code 13 and 11 Crank angle sensor. Where is the crank angle sensor, how do I test it, and could it have been damaged due to an overheat? Same questions for the temp sensor. Thanks

The code shows oxy. Sensor , this means there is something tripping the sensor . Could be fuel delivery , catalyitic converter , or something else . .....

It may be possible that there is a significant vacuum leak. Check all of the vacuum hoses for cracks or disconnection, or possible connection to the wrong sites.

Quite often the crank angle sensor is located at the front of the engine down near the bottom pulley that sits on the end of the crank. You should see (under the grime :) ) a small sensor with a pigtail leading to wiring harness. This should be your crank angle sensor.
It might be far easier to get your vehicle checked either via a diagnostic or sometimes you can put a loop back wire in to generate basic codes. This of course depends upon the system OBD or OBDII
Then you read the codes which are usually the amount of times the engine check light blinks or similar and you then check that code against a code list. Most good workshop manuals will have code lists and information on how to check your codes.

There is a connector but it is not like the connector used in the newer 1996 OBD2 cars, your year uses OBD1, here is how you check for codes in this car.

Acura OBD1 Codes Retrieval
Acura vehicles 1986-95 obd1 code retrieval
There are a few different ways to retrieve the codes for "check engine light" for Acura vehicles. One method is to use a led light (sometimes 2 led lights) on the computer or controller box itself. If it has 2 led lights, the color is red and amber. The red is used for flashing the codes whereas the amber is used for adjustment. If you have only a single led light indicator, then that is used for flashing the code.
The controller box can be found by lifting the carpet of the passenger side front foot well or floorboard. You can see the led lights without removing the controller. On other models, you can find the controller under the driver or passenger front seat.
The second way to get the code is using a jumper wire on the diagnostic connector located on the kick panel at the front passenger side. You then watch the codes being flashed at the dash panel after you turn the key on. To read the code being flashed is easy. Example: Code 23 is 2 long flashes followed by 3 short flashes. A longer pause separates the next code that follows.
Here are Acura vehicles 1986-95 general codes:
Code 0 Electronic control unit (ecu)
Code 1 02 (oxygen) sensor
Code 3 and 5 map sensor
Code 4 Crank angle sensor
Code 6 Coolant temperature sensor
Code 7 Throttle angle sensor
Code 8 Crank angle sensor (TDC)
Code 9 Crank angle sensor (CLY)
Code 10 Intake air temperature sensor
Code 12 EGR system fault
Code 13 Atmospheric pressure sensor
Code 14 Electronic air control valve
Code 15 Ignition output signal
Code 16 Fuel injector fault
Code 17 Vehicle speed sensor
Code 21 Spool solenoid valve
Code 22 Valve timing oil pressure switch fault
Code 23 Knock sensor
Code 41 Oxygen sensor heater fault
Code 43 Fuel supply system

Ignition module could be the colprit

IT IS MOST LIKELY YOUR CRANK ANGLE SENSOR IF YOU GET AN ENGINE LIGHT COME ON THAT MEANS THERE IS A CODE STORED YOU WILL HAVE TO GO TO A DEALER TO CHECK THE CODES

sounds like a crank position sensor. Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDI/II (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there.

i would suggest disconnecting the battery for 30mns then connecting this some times clears the code othr wise replace the sensor

remove positive battery for five minutes to re set the computre hook it back it should go out

I think that your crank angle sensor failed. Is the check engine light on?? if so, scan it and get code. If the code is P0335, than you need new crank angle sensor. Nissan has been having some problems with those even on other Nissan products. (Altima, Pathfinder and so on) Good luck.