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Toyota RAV4's have two (2) O2 sensors.
All O2 sensors are located in the exhaust system at various points.
All O2 sensors are threaded into the exhaust system at varoius points.
The 1987 Toyota Pickup came equipped in two 2.4L variants between turbocharged and naturally aspirated. This application has upstream sensors (Position 1), that is they are located on the exhaust manifold before the catalytic converter. The OE replacement O2 sensor is AC Delco #213119.
2
That year has 2 oxygen sensors.
There are 2.
2
they are on your exhaust manifold, just before the silencer
check the O2 sensors
There are several O2 sensors on that vehicle and they are all threaded into the exhaust system at various points.
On exhaust pipes before and after cat. converters.