Question about 2005 Subaru Legacy

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1995 Imprezza trouble codes

My '95 Imprezza is hard to start, runs rough, idles erratically, and shows fault codes for starter switch and engine coolant sensor. This model has the tuned intake manifold with an engine coolant sensor and a thermosensor mounted in the manifold.

The thermosensor has a single lead and operates the temperature gauge. It works fine. I haven't noticed any trouble with the starter switch.

Once the system is reset by leaving the negative battery cable disconnected for ~ 1 hour, then reconnecting and starting the engine, the engine light is off and the trouble codes are cleared. The engine starts fine, idles fine and runs fine. After driving for ~ ten minutes, the engine light turns on, the same trouble codes go into memory, the engine is then hard to start, and runs rough.

I have been told this year and model has electrical problems. Can anyone help me determine the trouble so I can fix it? Thanks!

Posted by on

  • vgaudio Dec 12, 2008

    The radiator fan runs constantly when the engine light turns on too!

  • vgaudio Mar 02, 2009



    Problem solved. I pulled the temperature sensor and tested it in cold, warm, and hot water. The resistance readings were out of specification at the high temperature range. I replaced the sensor. Thanks for your input!

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I would not recommend just resetting the light unless you have corrected the reason it was on…..Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on. I have seen the computer make the fan run all the time when it sees a problem with the coolant temp sensor.

Posted on Feb 28, 2009

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