[Kevin_The_Clean1]

I hope you fellas can help me out here. I've got a 2020 X3 MC that I'm restoring with only 1,700 miles on it. We're getting a check engine light saying the bank 2 (post cat) 02 sensor is bad.

(1.) So is bank 2 on the drivers side orientation or the passenger side of the factory downpipes... ?
(2.) Have you ever seen a 02 sensor fail that early... ?
(3.) Do the pre or post cat 02 sensor tend to fail more often... ?


https://www.realoem.com/bmw/enUS/sho...diagId=18_1751

[Kevin_The_Clean1]

This must be a pretty difficult question & knowledge only a few people know.

[Ramlimited4500]

I believe bank to is the back theee cylinders

[Ramlimited4500]

It shouldn’t of fail so soon either. Did you check the connections on the back of the valve cover to make sure they are properly connected there a little tricky

[Kevin_The_Clean1]

Originally Posted by Ramlimited4500

I believe bank to is the back theee cylinders

Originally Posted by Ramlimited4500

It shouldn’t of fail so soon either. Did you check the connections on the back of the valve cover to make sure they are properly connected there a little tricky

This is exactly what I thought. But simply wanted to double check beforehand just to make extra sure. It's a major PITA (pain in the ass) to reach things on or near the back of the S58.

https://www.realoem.com/bmw/enUS/sho...diagId=18_1751

[Ramlimited4500]

Originally Posted by Kevin_The_Clean1

This is exactly what I thought. But simply wanted to double check beforehand just to make extra sure. It's a major PITA (pain in the ass) to reach things on or near the back of the S58.

https://www.realoem.com/bmw/enUS/sho...diagId=18_1751

You got to have a double wrist and elbow set up to get them out 😹😹😹