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Oxygen sensors are mounted either side of the catalytic converter. Number 1 is mounted before the cat in the down pipe and the Number 2 is in the exhaust pipe just after the cat, think the number 2 is the downstream.
They are different types of sensors, but in your car the MAP (manifold absolute pressure) sensor, along with the BAROmetric sensor are used to estimate the required fuel flow through the throttle body injectors. These sensors measure pressures inside and outside the engine to estimate airflow. You do not have a MAF sensor. These are more common in later vehices with mulit-port fuel injection. A MAF sensor actually measures the airflow into the engine using a hot wire anemometer. You are correct in believing the sensors serve the same purpose, that is to calculate the fuel flow required for stoichiametric combustion. The oxygen sensor also feeds back to the computer to further refine the fuel charge by measuring oxygen in the combustion products. If excess oxygen is detected, the fuel charge is increased. This is known as closed-loop operation. Closed loop operation is not started until the engine is at operating temperature. If you have more questions, please let me know. I have pasted the location of the MAP sensor below. The sensor is mounted to the air cleaner, but it has a vacuum hose that leads to the throttle body, which is where the pressure must be measured.
There are two oxygen sensors: one is upstream of the catalytic converter and one downstream of the catalytic converter. The oxygen sensor, or O2 sensor is usually located near the catalytic converter.Oxygen sensor downstream of the catalytic converter in the exhaust system on the back of the engine.-------Thanks.Helpmech
On the SOHC engine the front (A/F) oxygen sensor is located in the
front section of the front catalytic converter. The rear oxygen sensor
is located in the rear section of the front catalytic converter. On the
DOHC engine the front oxygen sensor is located in the front section of
the exhaust system, just past the crossover pipe. The rear oxygen
sensor is located in the front section of the catalytic converter.
Oxygen sensor location-Baja 2.5L SOHC engine
Oxygen sensor location-Baja 2.5L DOHC engine
On the 2.0L engine the front (A/F) oxygen sensor is located in the
front section of the exhaust system, just past the crossover pipe. The
rear oxygen sensor is located in the front section of the rear
catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor
is located in the front section of the front catalytic converter. The
rear oxygen sensor is located in the rear section of the rear catalytic
There is only 4 sensors on a 2000 dodge intrepid and the bank 2 sensor 2 is the sensor located on the right (passenger) side and the one located after the catalytic converter (the one close to the firewall).
I think there is more than two. Either way, they are located in the exhaust system. The pre-cat sensors are in the head pipes, just below the exhaust manifold, and then there will be one right behind the catalytic converter. You will need a 7/8 inch wrench or possibly a special O2 socket.
1.The oxygen sensor is located where the manifold comes together and meet the exhaust pipe. 2. The second one would be located after the catalytic converter. Go to this website and you will see an example. http://www.walkerproducts.com/locations.html