cannot get computer to reset to get through emissions on 2001 Hyundai Elantra

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i have just replaced sensors input & output and o2. replaced thermostat, have a less than year old exhaust system,brakes. all repairs done by reputable garage(s)replaced o2 sensor twice every time we try to reset computer per emissions the check engine light comes on with same code o2 slow response. also have checked all connections to computer, manifold for cracks,etc.only 62,000 miles on car about 1,000 dollars in repairs in 8 months
(1) Answer
My sister just finally passed inspection with her 2002 Elantra. Same exact problem and the sensor was replaced twice. Here's what you need to do. I know it doesn't make sense but I found it in a tech bulletin. You need to remove the alternator bracket that connects to the block as well as the engine ground and body grounds near the battery. Clean them off with a wire brush and also clean off where they connect to the body of the car. Reconnect them and clear the engine light. My sister's finally passed after that. It did not pass for 2 years until this was done.