This weekly Q&A session answers your questions about cars and trucks. This week explores a 1996 Ford Explorer with heated oxygen sensor heaters.

Question: 1996 Ford Explorer

Hello Mr. Ciulla: I hope you are doing well; I'm from Mexico so I apologize for my bad English. Below you can see that I started to solve an oxygen sensor problem. According with your suggestion I change one of the 3 sensors and now it shows a error P1113 and it seems like the sensor (the new one) is not working well.

The mechanic was checking the power supply of each sensor and there is not 12 volts to supply to the sensor heater. It seams like the computer (PCM) is not sending the signal to turn on the heater, could you help me to understand why the sensor is not receiving the power supply to the heater?