CODE 13
Trouble Code 13 indicates that the exhaust stream oxygen content sensor (O2 sensor) is not responding as expected. When cold, the sensor is 'biased' by the ECM to about 450 millivolts. Before it warms to at least 600 deg F (315 deg C) it acts as an open circuit and when the ECM reads it, it reads the 450 mV bias. The ECM expects the sensor to warm in a short period of time and begin sending its own voltages.
http://www.basinger.us/Impreza/04.%20TRANSMISSION/03.%20AUTOMATIC%20TRANSMISSION%20(DIAGNOSTICS)/11.%20List%20of%20Diagnostic%20Trouble%20Code%20(DTC).pdf
The link above is for code 74-77.
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