Toyota RAV4's have two (2) O2 sensors.
You have two oxygen sensors in Toyota Rav4, One before the catalytic converter and another after.
There are two in front on my 1998 Rav4. One on each rail in front, left and right. But, It depends on how many airbags the car has. For example, if there are side air bags as well there will be additional sensors for the side air bags.
The 2.5 has 2 O2 sensors (both on top of the engine) and the 3.5 has 4 O2 sensors (two on top, and two under the car).
In the center of the front dash near the windshield. Two small (1/4" or less) sensors.
There are 4 sensors on the manifoldcoming out of the engine. The highest two are the Air Fuel sensors. You can see them easily from above the engine. One is behind or in a heat shield. There are two more sensors that are lower. These sensors are the oxygen sensors. When ordering you need to know if the sensors are right hand or left hand, don't forget that is from the drivers seat not the way you face them from front of the car.
the rav4 Toyota has four 02 sensors, i would reccommend going to your local Toyota dealer, go to parts dept, and tell the pars guy which bank it is and which sensor because they are not all the same. there is one located on top of the exhaust mainfold, and then one below, and the other two are under the car going through the floor board.
Two. One in manifold and another behind catalytic convertor. Just paid $137.00 for that little baby!!!! OUCH.
There is no bank one and two on my daughter's RAV4 because it is a four cylinder and has only one bank for bank speaks of rows of cylinders. If bank 2 is being used on this RAV4 then it is a misnomer. There may be a sensor on the top and the bottom but they should not be called bank one and bank two.
on top of the intake held on by two 10 mill bolts
Remove the two screws that you can see in the indentation on the top of the dash. Then remove two screws under the lip of the dash. It will take a good pull but it will come off.
It has two. One is before the catalytic converter (Bank1 Sensor1) and one after the catalytic converter (Bank 1 Sensor2)