What could be wrong with my Ford F-150

The sensors are as follows:
o2 sensor heater circuit malfunction (Bank one sensor 1)
02 sensor heater circuit malfuncton ( Bank one sensor 2)
02 sensor heater circuit malfunction ( Bank 2 sensor 1)

I have the reading and this is what is beside of each sensor
P0135= BANK ONE SENSOR 1
P0141= BANK ONE SENSOR 2
P0155= BANK 2 SENSOR 1
THANKS FOR YOUR HELP!

I forgot to mention, we changed the bank one sensor one and bank one sensor 2 the first day then the next day had changed the bank 2 sensor 1. Would this have caused it to Malfunction again. We had changed the 2 ( The garage had told us the bank 2 sensor 1 was the same as bank one sensor 2) and drove 100 miles ( Auto zone told us we had to do that everytime we messed with a sensor) and the light never went off. We took it back to Auto zone had them to test it again and it showed the bank two sensor one. We then changed it drove another 100 miles and the light stayed on. Went back to auto zone had it retested and then it showed all 3 sensors were malfunctioning.

I dont know if this is right or not. I know its the case on the big rigs Ive worked on and some small cars. But once there's a code logged in. Even after the part is changed the code needs to be cleared. Just a thought. Might not be the case on your vehicle. But its worth checking out!

After the parts were changed we had reset it and it still came back on.