Remove from below is really the only option
Most likely. I dont think ill attempt removing the manifold.
My sensors been replaced before by a mechanic, he said it looks burnt but after reviewing threads it seems like its just easily covered in carbon. Im trying to save myself from spending if i can clean them instead of switching them, unless they are really done for.
This might make it easier to take out, hopefully he didnt tighten them like oem did.
I read online that acetone can be used and someone recommended dipping it in CLR. Any experience in using any household products to clean o2 sensor?