Look down there again. On either side of where you tried to put your wrench is a nut on a stud. The O2 sensor is flanged...MLB said:I thought they had a nut that you put a wrench on, but mine is just round??
(96 mini, rear o2)
I'm not sure what you are looking at. Doesn't your sensor look like this?MLB said:Ok, I've just looked at the replacement URD sent me. So you're saying there is a nut on the existing o2 that I'll take off and reuse to hold this one?
Big blizzard here and very cold, so i haven't felt like crawling around underneath
There are 2, one upstream and one downstream of the cat(s). The upstream one provides feedback to the ecu for fuel trim. Downstream just monitors the catalyst I think.CYi5 said:when cleaning your 02 sensors, should u clean both of them? Or is there only 1?
That is how I understand it as well, and if there isn't any check engine light the second one doesnt need cleaning. It normally gets cleaner exhaust after it has gone through the cats anyway. The first one would need the cleaning to get more accurate readings and adjust your fuel trim accordingly.flatlandtacoma said:There are 2, one upstream and one downstream of the cat(s). The upstream one provides feedback to the ecu for fuel trim. Downstream just monitors the catalyst I think.
MLB said:The code I have is for the rear sensor. My gas mileage is down 3-4 mpg since the CEL came on. It's got SOMETHING to do with the EFI.