P0171 code comes up on 1998 ford contour 2.0

Question

how can I find which sensor is causing this code

Answer 1

HI there,

This code is usually the result of a few possible issues. First, a bad mass air flow sensor, an intake manifold gasket leak or on these the hose for the PCV valve, low fuel pressure or the front O2 sensor. All of these items need to be checked to resolve the issue.