On a 1997 Ford Expedition :
Bank 1 is the passenger side of the engine
Sensor 1 would be close to the engine before the exhaust enters the catalytic converter
Those are the oxygen sensors in the exhaust above the catalytic converters.
Bank 2 is the drivers side of the engine in a Ford Expedition Sensor 2 is after the catalytic converter ( downstream )
its located in the back of the motor.
Bank 1 is the passenger side of the engine in your Ford Expedition Sensor 1 is in the exhaust system before the exhaust enters the catalytic converter ( upstream )
TWO REQUIRED BANK ONE SENSOR IS LOCATED IN THE BACK OF THE MOTOR. CLOSE TO THE FIRE WALL ON THE EXHAUST MANIFOLD. bANK TWO SENSOR IS LOCATED ON THE CATALYST TOWARD FRONT OF THE MOTOR. BANK ONE YOU CAN USE A OXYGEN SENSOR SOCKET AND A LONG EXTENSION, BANK TWO WILL REQUIRE A COMBINATION WRENCH (7/8) IN SIZE.
On a 2000 Ford Expedition ( 4.6 and 5.4 ) Bank 2 is the drivers side of the engine Sensor 1 is close to the engine BEFORE the exhaust enters the catalytic converter
Bank 1 is the passenger side of the engine on a Ford Expedition Sensor 2 is in the exhaust after it has passed through the catalytic converter ( downstream )
Bank 2 is the drivers side of the engine Sensor 2 is downstream of the catalytic converter ( after the exhaust gas has passed through the catalytic converter )
both sides you need to know which bank you are working on the scanner should have said something like bank 1 sensor 1 or bank 1 sensor 2 a bank is a side of the motor bank 1 is the side with cylinder #1 and the the other side is bank 2 if it is sensor 1 then that is before the catalytic converter if it sensor 2 then it is after the cat. hope that helps
Bank # 1 is the passenger side of the engine in a Ford Expedition Sensor # 1 would be before the catalytic converter ( upstream sensor ) Sensor # 2 would be after the catalytic converter ( downstream sensor )
The bank 1 oxygen sensor on a 2003 Ford Taurus is located on the motor. It is on the top, back part near the firewall.
Bank 2 is the drivers side of the engine in your Ford Expedition Sensor 1 is in the exhaust BEFORE it enters the catalytic converter ( upstream )