Where is the oxygen sensor located on a 1994 toyota corolla? how do you install an oxygen sensor on a 1994 toyota corolla?

oxygen sensors(O2S) are located after the cat converters
heated oxygen sensors (HO2S) are located in the exhaust manifold/ exhaust pipe before the cat converters
they are different sensors performing different jobs so rich or lean problems will be the HO2S in the manifold

Depending on the motor there are either 2 or 4. Usually 2. 1 before the converter & 1 after the converter. 4 cyl.

O2 sensor is normally sticking out of the exhaust manifold

1.6 GLi COROLLA

DTC NUMBER TROUBLE AREA 12 RPM signal 13 RPM signal 14 IGN signal 16 ECT Signal 21 Oxygen sensor signal 22 Water temperature signal 24 Intake air temperature sensor 25 Air / Fuel ratio lean 31 Vacuum sensor signal 41 Throttle sensor 42 Vehicle speed sensor 43 Starter signal 52 Knock sensor 51 Switch COND

The fuel pump relay is located in the fuse box drivers side of fuse box

There are usually several. You should start seeing them from the joint of the Exhaust Maniflold downward past the Catalytic Converters. If you have two Exhaust Manifolds, then each side may have a pair of O2s.

There is an Inexpensive Socket needed to remove each O2 sensor, looks a little strange because it has a slot for the wire on the sensor to clear the Socket. Two O2's may be used on each bank because a before and after reading will evaluate the Catalytic converter efficiency.

For sure you will be crawling underneath your car to reach them.

One and it will be on the exhaust manifold

Hi:
Your Corolla has 2 oxygen sensors; one before the catalytic converter, and one after!

Depending which O2 sensor it is, it will be located after the exhaust manifold before or after the Catalytic Converter.

theres no cable in toyota corolla 1994 check the speed sensor or replace speedometer have same problem with my 1993 toyota corolla