Toyota RAV4's have two (2) O2 sensors.
You have two oxygen sensors in Toyota Rav4, One before the catalytic converter and another after.
4 all together
2
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 2011 Toyota RAV4 has 16 valves.
The 2001 Toyota RAV4 has 16 valves.
The 2005 Toyota RAV4 has 16 valves.
The 2003 Toyota RAV4 has 16 valves.
The 2014 Toyota RAV4 has 16 valves.
The 2007 Toyota RAV4 has 16 valves.
The 2002 Toyota RAV4 has 16 valves.