June 18, 201213 yr 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
June 18, 201213 yr Don't understand the question. Knock sensor and the two O2 sensors are completely different.
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