2003 Nissan Sentra 1.8L, what is p1278 cylinder #8 high to low side open?

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OBDIITech · Answer 1 · 2021-01-29T23:56:04+0000

There is no cylinder #8 on your Sentra, you only have 4 cylinders. The P1278 code is for the Air Fuel Ratio Sensor.

P1278 NISSAN - Air Fuel Ratio Sensor 1 Bank 1 Circuit Slow Response
Read more: https://www.autocodes.com/p1278_nissan.html