Hi and thanks for using 2CarPros.
The two codes are really separate from each other. One deals with an ignition issue and the other a coolant temperature sensor, either of which can cause a rough idle.
What I have done is attach the diagnostic flow charts for both conditions. However, I had to attach them in picture form. Read through them and see if they help. If there is something you can't read on them, let me know.
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DTC 21
The ECU did not detect the ignition primary signal during starting or running.
Code 21 Ignition Signal Diagnostic Chart / See Pictures 1-4
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DTC 13
The ECU detected an open or shorted circuit. (An abnormally high or low output voltage is entered.)
Code 13 Engine Temperature Sensor Diagnostic Chart / See Pictures 5 - 8
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Let me know if this helps or if you have other questions.
Take care,
Joe
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Saturday, February 2nd, 2019 AT 10:43 PM