I don't know why this is bringing back memories but, I had an 06 Sentra Spec-V that threw a code at 20k miles and went into limp mode. Dealer said it was the throttle position sensor or something along those lines. They replaced under warranty and all was good until 600-700 miles later when it happened again. My remedy, I went to the store and bought some purple power, and used that with a good power wash under the hood in the engine bay. Reset the battery and never had another "Service Engine Soon" light again, and trade it in with 93k miles on it.
Not recommending you do this, it is what worked for me on a different Nissan model.
You can buy a reader off Amazon for pretty cheap. Get the codes and post them here, I am pretty sure someone can help you.
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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