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it could possibly be your lambda sensor
One is in the exhaust manifold on the passenger side, the other is in the exhaust after the dowpipe.
A MAF sensor for a Subaru Impreza can cost anywhere from $70 - $150 depending on the type of Impreza you have.
The speed sensor on a 98 Impreza is on the gear box. it is on the driver's side under the bulkhead.
The fuel temperature sensor is located inside of the tank in the Subaru Impreza. This is the case for the cars that were made in the 1990's, at least.
built in with MAF sensor
The computer will tell you. If you have a "check engine" light, connect a code scanner to see what the computer has detected. If there is a problem with the oxygen sensor the code scanner will display the appropriate problem code.
it is in the water manifold
There are two oxygen sensor for Mitsubishi Outlander. Front Oxygen Sensor and Rear Oxygen Sensor
On exhaust pipe after cat
There should be a connector under the car that it plugs into. It then goes to the computor.
Upstream o2 (oxygen) sensor. Should be directly behind your radiator, down low. It's the one in your exhaust manifold.