Ive changed the o2 sensor three times but still have a p0171 code

Question

I've changed the intake gaskets,cam timing sensor,the mass airflow sensor and still get that code .

Answer 1

Hi there,

This code can also be the result of an exhaust leak and also at times a weak fuel pump. Also, I have seen the front sensor also cause the 171 code, so if you have replaced the rear sensor, replace the front. Same can be said about the rear sensor, if you replaced the front sensor, it's ok to try the rear sensor.