Whats up peoples,



My 02 sensor came loose on the car. I noticed this cause the 02 wouldnt read anything and just go full lean. after a day or two I ended up tightening it up, and it seemed to fix it. But now its taking longer to warm up and still reads full lean for a few minutes, then it begins to work and read the air/fuel mixture. my question is, does the o2 need to be calibrated or something since it came into contact with regular air? Or is this the first signs that the o2 is going bad?