There is a total of 3 O2 sensors 2 Upstream and 1 Downstram
2
they have 2 o2 sensors on the muffler ELIA
You must mean Oxygen sensors. There are 2 upsteam (O2 sensors) and there are 2 downstream (catalyst moniters).
4 cylinder Camry has 2 oxygen sensors.
o2 sensors are located on the muffler located in the back there are 2 o2 sensors each costing about $70 each at your local auto zone hope this helps ELIA
Upper O2 sensors are typically screwed into the exhaust manifold, just before the headpipe.
the o2 sensors are located on the exhaust pipe one by trans and one by the muffler there is 2 of them
The 2002 2.4L has 4. 2 on the exhaust manifolds, one before the catalytic converter and one after.
There are a total of ( 4 oxygen sensors ) according to the engine wiring schematic for the 1997 Mercury Mountaineer in my Haynes repair manual ( 2 oxygen sensors are " upstream " sensors used by the PCM to adjust the air / fuel ratio of the engine ) ( 2 oxygen sensors are " downstream " sensors / catalyst monitors )
2, a up stream (before the converter) and a down stream (after the converter)
you have 4 o2 sensors 2 up stream 2 down stream they are located in the y-pipe of your exhaust 2 before your catalyst and 2 after