P0171 2007 Nissan Sentra -

Question

Also have the code P0725 as well as P0171. What can this be? Also about how much to fix the problem? TY

Answer 1

Hi there,

The P0725 is usually caused by a faulty crank position sensor. The P0171 most commonly is a problem with the mass air flow sensor. These would both need to be tested to determine if they are the problem. The 171 can also be caused by low fuel pressure, intake manifold leaks.