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Four. There are two located before the catalytic converters and two after the catalytic converters.
The are referred to as bank 1 and bank 2 and sensor 1 or sensor two. Bank 1 is always the same side of the engine as the number one cylinder. Bank 2 is the other side. Sensor 1 is always before the catalytic converter. Sensor 2 is after the catalytic converter.
Bank 1 sensor 1 - same side of the engine as the number one cylinder and before the cat.
Bank 1 sensor 2 - same side of the engine as number 1 cylinder, after the cat.
Bank 2 sensor 1 - Opposite side of the engine as the number one cylinder and before the cat.
Bank 2 sensor 2 - Opposite side of the engine from number 1 cylinder and after the cat.
It's called bank, not base. On a v6 or v8, each side of the engine is called a bank. Bank 1 is always the side where the number 1 cylinder is located. On Fords, number 1 is on the right bank or side, the right as if you were sitting in the vehicle, so well, the passenger side. Sensor 2 is the oxygen sensor in the exhaust stream after the catalytic converter (somebody recently called it the cadillac converter!). You have two oxygen sensors on the right bank, one before the cat and sensor 2 is after the cat. The only purpose of sensor 2 is so the computer can monitor the efficiency of the catalytic converter. It compares the readings from sensor 1 and sensor 2. Sensor 1 information is how the computer adjusts fuel trim.
P1166 Negative feedback from the 02 control,in better terminology its taking in false air,and it cant control it,The solution your engine has a MAF (Mass air flow), inspect this air duct for looseness,or cracks that can cause false air into the intake, this include the intake manifold gasket, and even the air filter condition.Something that can cause a lean condition from false air to low fuel pressure.But mainly false air.The location go to the front where the main engine pulley is at. (Some engine are transversed). You have 2 valve cover gasket the closet one to you is the first bank ,the one farthest away from you is the second bank,rule of thumb where cylinder number one is that is bank one.And sensor 1,the first sensor.
They are in the relay bank which is located above the fuse block. The glove box assembly must be removed to gain access to the relay bank. This relay bank is square in shape and contains the horn relay, turn signal flasher, hazard warning flasher, and circuit breakers for the power windows and power door locks/headlamp doors.
cant help you unless you give us the make and model of the car... also the exact code would help alot too. lean on both banks usually indicates a vaccum leak. or possibly intake gaskets. mass air flow... could be a number of things
Bank 1 is the same side as the number one cylinder, bank two is the other side of the motor. Sensor 1 is always before the catalytic converter, sensor 2 is always after the catalytic converter. So bank 1 sensor 1 would be on the same side of the motor as the number one cylinder and before the catalytic converter.
Bank 1 Is generally the side of number 1 cylinder for v-6 and v-8 a four cyl is self explanitory,as far a sensor location,number 1 is before the cat.and number 2 is after the cat.since I dont know your exact engine I cant give you a diagram,so I hope this helps if not...leave me more info and I will get back to you have a good day Darrell
Oxygen sensors are numbered by which bank of cylinders they serve. Bank 1 is the left or drivers side bank of cylinders on the 4.3L which has the odd numbered cylinders 1,3, and 5. Bank 2 is the right or passenger side bank of cylinders numbered 2, 4, and 6. The Bank 1 Sensor 1 would be the sensor for the left hand side of the engine AHEAD of the converter. Bank 1 Sensor 2 is the sensor for the left hand side bank of cylinders BEHIND the converter.
I usually take the 4 10mm bolts that hold the coil module assembly to the valve cover. take the front bank wires off as a set as well as the rear bank. lay them out on a work bench get a sharpie and mark where the wires go throuh the looms. do one at a time and mark the tops of the wires with there number.