Where is the O2 sensor on 1993 Toyota Mr2
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.
The 1993 Chevrolet K 1500 pickup truck 02 sensor is on the back of the air cleaner housing. The O2 sensor should be labeled as such.
The O2 sensor on a Toyota Corolla is located on the exhaust manifold. The O2 sensor properly reads the air fuel ratio to tell the engine how much fuel to use.
The O2 sensor on a 1988 F250 is not near the engine. Go to the exhaust manifold and down the length. It is near the catalytic converter.
For the 1993 Toyota Tercel, the O2 sensor has three different wire colors. These colors are: black, blue, and white.
See related link which includes instructions for testing any O2 sensor.
The one closest to the exhaust manifold is the upstream O2 sensor.
They are screwed into the exhaust pipe/pipes.
O2 sensor
When a O2 sensor goes bad the check engine light will illuminate. The code set in the ecm will lead you to which O2 sensor is bad.
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)