Help! Oxygen sensor!!!
 

I have a 92 f-150, and I have a question about the oxygen sensor. Long long long story short, the thread connecting the sensor pipe to the exhaust right after the cat converter broke. So I was just wondering if it's good that I just put a weld on there to keep it in tact? I'm losing about 20% fuel mileage driving it right now, and it sounds so so bad. Help!

yep just weld it back on... thats how it got there to begin with...