Ford Repair: po141 how to fix, mass air flow sensor, mass air flow

Question
QUESTION: I have this code on my 2002 f150 4.2 . I replaced th 02 b1s2 as the code read heater circuit malf. Now I still have this code and want to know how to find problem. I have been told it could be in the wirring harness to the sensor but not sure how to test.

ANSWER: Pull the code and give it to me, I believe that you needed to replace the B1S1 sensor.

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QUESTION: po141 b1s2 heater circuit malfuction. I have changed all o2 sensors

Answer
Have the truck put on a Genysis scanner to check sensor output. Most garages have one but they are not cheap. So don't be shocked at the $50 charge w/o labor to have it used. Sometimes the Mass Air Flow sensor can cause an O2 sensor error. How many drive cycles have you repeated.