What does code P1171 on an Isuzu Rodeo mean?

i have just gone through this same situation, in my case it follows with i think 1157 or 1137 regardless they are o2 sensor codes. funny enough this , in my case, led to the MAP sensor found center rear of intake manifold. worked for me 100 CAD new pop it out and replace it should be good as new!

Good luck