PO155 oxygen sensor bank 2 sensor 1 heater current malfunction

1996 FORD THUNDERBIRD
98,000 MILES
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SHAWHOUSE
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I have a 1996 thunderbird, 4.6 liter. I get an error code of PO155 {oxygen sensor bank 2 sensor 1 heater current malfunction} this car has 4 oxygen sensors. Which one is bank 2 sensor 1?

There is a sensor in front of and behind the drivers side catalytic converter, and a sensor in front of and behind the passenger side catalytic converter. Which sensor is the bank 2 sensor 1. Or how are these 4 sensors numbered.
Oct 31, 2011 at 7:24 PM
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MERLIN2021
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Bank 2 is drivers side, and sensor 1 is before the cat. Sensor 1 is the fuel system monitor, sensor 2 is the cataltic converter monitor.
Oct 31, 2011 at 7:31 PM
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