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o2 circuit restart

chickenleggs
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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Hi all. Back for a little help.

I just replaced the knock sensor and battery, checked codes and still have the o2 sensor circuit not active message. Anyone know how to get this happening again.

I have a 95 legacy wagon m/t 2.2l

any help is muchly appreciated

Don't understand the question.

 

Knock sensor and the two O2 sensors are completely different.

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