New Oxygen Sensor, 1 yr old CAT CONV. Engine light is on, wait or buy OEM Sensor

What is your question?

Tuesday, July 25th, 2017: Today took the 2003 Hyundai Elantra Gt for a ride, the fuse didn't blow, FUSE is intact and perfect. But... the engine light is still on. New Oxygen Sensor 7/25/2017. Recent new Catalytic Converter also, 3/01/2016. 1) I was also told, 7/25/2017, maybe to take the car on the highway and get the heater wire to get to temperature and the engine light will go out. And or the computer will accept it.....? 2) Get my mechanic friend to turn the engine code off and wait and see if it goes back on. If so change the Oxygen Sensor....? Recent changes. 1) Replaced original Oxygen sensor 2 days ago, 7/23/2017, and the fuse blew. Replaced fuse. 1A) Recently. 1 month ago, 6/2017, passed emissions test, got tags!! 2) There is a new catalytic converter, replaced 15 months ago. 3) I was told by a certified mechanic after an inspection, that the catalytic converter was turning blue......he said maybe try changing the oxygen sensor for starters. so i did and recently. Rest of inspection was great and no other concerns. **I need the car for work reasons and until I find another, but if if my problem is fixed, then I'm good....... **I'm looking for the RepairPal experienced mechanics for quick answers or approvals and ideas. Thank you ALL!!!