ok before all this happened my o2 sensor wasnt connected (didnt even know what it was) and was running well , then my brother in law decided to connect it , started and ran well so decided to leave it . My car went low batt so i jump started it and water and black sutt started running out of my exaust ..
Is this normal or should i just remove it completely ?
Was it because it went low batt?
is the o2 sensor necessary ?
ect..
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