Hi there,
There are several possible causes for these codes. Each has to be eliminated before buying the correct part.
P0014 indicates an issue with the exhaust valve timing control. Here is a list of possible causes.
P0014 NISSAN - Exhaust Valve Timing Control Performance Bank 1 Read more: https://www.autocodes.com/p0014_nissan.html
P0300 indicates a misfire on random cylinders. Here is a list of possible causes.
P0300 NISSAN - Cylinder Misfire Detected Random Cylinders Read more: https://www.autocodes.com/p0300_nissan.html
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