On a Ford, Bank One is the cylinder head with cylinder #1, #2, #3 cylinders.Bank 2 is the other cylinder head with cylinders #4, #5, #6. O2 Sensor's 1 are between the exhaust manifold and the Cats. O2 sensor's 2 are after the Cats. An general rule of thumb to identify cylinder #1 or bank 1, look at the engine from the drive belt end. See what cylinder head is closer to the drive belt, That is bank 1. The cylinder closest to the drive belt in that head is cylinder #1.
I hope this helps.
Bank 2, sensor 2 is at the bottom of the engine as you look in from the bumper. It is installed in the exhaust pipe just below the catalytic converter. The bank 1, sensor 2 is at the same location on the back of the engine below the firewall.
See pictures below
SOURCE: more 99 cougar problems
there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out
160....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161....O2 Sensor Heater Circuit (Bank 2 Sensor 2)
P0162....O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164....O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165....O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167....O2 Sensor Heater Circuit (Bank 2 Sensor 3)
P0168....Fuel Temperature Too High
P0169....Incorrect Fuel Composition
P0170....Fuel Trim (Bank 1)
P0171....System too Lean (Bank 1)
P0172....System too Rich (Bank 1)
P0173....Fuel Trim Malfunction (Bank 2)
P0174....System too Lean (Bank 2)
P0175....System too Rich (Bank 2)
P0176....Fuel Composition Sensor Circuit
P0177....Fuel Composition Sensor Circuit Range/Performance
P0178....Fuel Composition Sensor Circuit Low Input
P0179....Fuel Composition Sensor Circuit High Input
P0180....Fuel Temperature Sensor A Circuit
P0181....Fuel Temperature Sensor A Circuit Range/Performance
P0182....Fuel Temperature Sensor A Circuit Low Input
P0183....Fuel Temperature Sensor A Circuit High Input
P0184....Fuel Temperature Sensor A Circuit Intermittent
P0185....Fuel Temperature Sensor B Circuit
P0186....Fuel Temperature Sensor B Circuit Range/Performance
P0187....Fuel Temperature Sensor B Circuit Low Input
P0188....Fuel Temperature Sensor B Circuit High Input
P0189....Fuel Temperature Sensor B Circuit Intermittent
P0190....Fuel Rail Pressure Sensor Circuit
P0191....Fuel Rail Pressure Sensor Circuit Range/Performance
P0192....Fuel Rail Pressure Sensor Circuit Low In put
P0193....Fuel Rail Pressure Sensor Circuit High Input
P0194....Fuel Rail Pressure Sensor Circuit Intermittent
P0195....Engine Oil Temperature Sensor
P0196....Engine Oil Temperature Sensor Range/Performance
P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
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