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Message: <blockquote data-quote="Tbuck07" data-source="post: 563110" data-attributes="member: 10400">yeah its pretty doggy with that o2 sensor..Do you know which one is the fan? And why isnt the fan kicking on then..? I swear i swapped over my old one on one side, and there was already a sensor in the intake on the other..the one on the right side (looking at it from the front) was the one already in it..I gotta get that figured outNoticed Im leaking a bit of oil onto my exhaust, pretty sure its a loose valve cover bolt..but eh..Any help on that sensor is appreciated..I tried to switch them, but both sensors on the outside part have a line of plastic, one is center, one is offset..so the plugs cant be switched around, wont fit..</blockquote>