Question

200 Nissan Sentra 1.8L codes p0037 and p0051 could they be fixed by replacing the airflow meter and air filter?

Answer 1

Its either going to be the air flow meter of the O2 sensor they both measure air ratio, it could fix it

Answer 2

P0037 NISSAN - HO2S12 Heater Control Circuit Low
Read more: https://www.autocodes.com/p0037_nissan.html

P0051 NISSAN - HO2S21 Heater Control Circuit Low
Read more: https://www.autocodes.com/p0051_nissan.html