This is kinda an odd place for maintenance issues, but I'll try my luck anyway.
I drive a 2002 Toyota Corolla, and I'm removing the pre-cat O2 sensor.
Here's a picture below.
The oxygen sensor is attached to the diamond-shaped flange below. However, I cannot simply pull it out because the vertical bolt is in the way. I also cannot remove the vertical bolt because the O2 sensor is in the way. Its a chicken and egg problem and I've no idea how to proceed.
I tried tightening the vertical bolt, but it has run out of threads. My only idea remaining is to buy additional nuts, and place it on the top part of the vertical bolt and hope to compress the spring, and hopefully give enough room for the O2 sensor to be removed.
Any ideas? The new O2 sensor comes attached to a new diamond-shaped flange.
Thanks in advance!
EDIT: The vertical bolt cannot be tightened anymore as that is the way it was designed. Its already pressing its maximum against the exhaust manifold due to the bolt shape.