P0031 NISSAN - Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low P1148 NISSAN - Closed Loop Control Function Sensor 1 Bank 1 You should start by replacing the front (Air/Fuel Sensor) O2 sensor. Attached images show sensor location.
36.2k questions
32.2k answers
1.3k comments
22.8k users