There are 2 sensors. The main one is located in the exhaust manifold (facing you as you look at the engine from the front of the car). The secondary sensor is located behind the catalytic convertor, which is under the car, approximately beneath the front passenger seat. On some cars, somewhere around 1999, Toyota started using an air/fuel sensor instead of an oxygen sensor in at least one of these locations, so you need to be sure which one you have before replacing. They are not interchangeable.
Testimonial: "Iam confused is it 2 or 4? my car is a v6 not 4cyl"
4 total, 2 "upstream" and 2 "downstream".
Testimonial: "great!!!!!!!!!!"
SOURCE: o2 sensors on a 99 mercury cougar v6
Should be 4. One in front of the catalytic converter and one after on both front and rear exhaust.
SOURCE: location of bank 1 sensor 1 o2 sensor
Should be in the manifold on the back side closest to the firewall.
SOURCE: Need to locate knock sensor on 1999 camry V6. Where is located.
i have toyota windom 4vz-fe i need locate knock sensor
SOURCE: P0420 and P0430
The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.
SOURCE: toyota 98 camry v6 cambelt timing marks
Click on the following free direct Link. It has the Timing: Belt and Mark Diagrams for your 1998 Toyota Camry. Plus additional Instructional and Directional Diagrams.
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1998/make/toyota/model/camry/1998_toyota_camry_timing_belt_diagram_marks.htm
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