Question

What is the difference between the engine code P0031 and P1148 for a 2007 Nissan Altima 2.5L?

Answer 1

What do you mean by difference? The ECM tests each system of the vehicle and sets the codes of the ones that fail. The codes are for different problems, but fixing the P0031 code could fix the P1148

P0031 NISSAN - Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low
Read more: https://www.autocodes.com/p0031_nissan-2.html

P1148 NISSAN - Closed Loop Control Function Bank 1
Read more: https://www.autocodes.com/p1148_nissan.html