hey, i'm putting in o2 sims and now i need to fill the little hole in the exhaust pipe. anyone know off hand what size bolt i will need?

 

i work at a jeep dealership and that is where i got my bolts. between 99-01 the wrangler 4.0 had some issue about the locations of the sensors on the exhaust manifolds or something(can't remember the reason) so they had to make these plugs. they are designed for the purpose of plugging an o2 sensor hole. i think i paid about 7 bucks for both but i cant remember what the actual price was. if you dont like that idea maybe someone will post the size of the bolt.

 

Just put the old O2 sensor in there and leave it unplugged. That way you don't need to buy anything and it fits perfect.

 

good call. thanks.