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as above, after fitting apexi stuff and hence disconnecting the factory boost solenoid, i have the 'engine check' light on permanent as a result of the disconnection.
Replacing it with a 10K resistor (only needs to be low power hence the high value) does the job on the MY99 Impreza. The voltmeter resistance of the solenoid was about 30 ohms, but a resistor that low would need to be chunky and gets hot. Note that the solenoid is usually high side drive and is activated by pulling low and has a constant 12V on the other line.
Yes any say 0.5 W resistor of about 10K value would do. Note I have only done this on my car and others have found it works on the MY01 - proceed at your own risk.
The three way solenoids on early MYs are approx 50 Ohms. Although, I've not tried it myself I'd like to concur with John's *sensible* answer - in theory it should work the same.