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ANSWERFirst, I want you to understand what the orientation of the O2 sensors are. Bank 1, sensor 1 is the O2 sensor located upstream of the catalytic convertor on bank 1 of the engine, which is whatever side the #1 cylider is located on. In the case of a Ford (since you asked this question in the Ford Taurus catagory, so I am half assuming you have a Ford Taurus), bank 1 would be on your left, if you are standing facing the engine with the pulleys toward you. (actually referred to as the right side because it's supposed to be as your sitting behid the steering wheel) Bank 1, sensor 2, is the O2 sensor on the same bank, but it is located downstream from the catalytic convertor. Bank 2, sensor 1 and the bank 2, sensor 2 O2's are in the same positions except they are on bank 2 of the engine.

Each O2 sensor has four wires going into it. Two of those wires are ground and power to a heating element inside of the O2 sensor, and two of those wires are for the Powertrain Control Module (PCM), or the "computer" to get O2 readings from the sensors.

The codes you have indicated are because the PCM sees an incorrect draw on the heating element circuits on both the upstream and downstream O2 sensors on bank #1 (possibly an open circuit), and it sees a faulty signal on the sensor circuit on the upstream O2 on bank #1. It is a small chance that you have two bad O2 sensors on bank #1, but more likely you have a wiring problem. There is no fix that anyone can tell you without being able to run circuit tests on the car. Now, if you want to try and blow a couple of O2 sensors on the car yourself, they are about hundred bucks each. If that seems better to you than spending $80 or $90 to go to a shop and let them diagnose it, then that's your choice. But that car needs to have the wiring harnesses ohmed out in the suspect O2 sensor circuits to make sure you don't have a wiring problem first. The PCM itself could even be your problem. There is no way to know without checking the car out in a shop.

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โˆ™ 2014-07-14 20:01:44
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Q: What does O2 sensor heat current malfunction bank 1 sensor 2 O2 Sensor circuit high volts bank 1 sensor 1 O2 heater sensor circuit malfunction bank 1 sensor 1 mean and how can it be fixed?
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