I recently installed an HHO generator in my 2006 Subaru forester. The unit works well however the extender I put in front of my O2 sensor is giving me a little bit of a problem. The check engine light is constantly on and the cruise control light blinks on and off. Any thoughts?
You may need to go the the electronic EFIE which will change the value of the signal being sent to the ECU from the oxygen sensor.
earthbound1 
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