Hi - I have a 2007 F150 with 31,000 miles that just threw a P0138, B1S2 stuck high. I went to change the rear passenger side sensor, the one in the cat, and it was seized. It eventually came out but the threads were mangled. I managed to get lucky and catch a thread with the new one and get it installed but I have to ask...Is it normal for them to seize like that from the factory? Thanks!

BTW - thanks for this forum. It's a great source of information.

 

It's not normal to have one go bad at 31K...