I recently had my stolen catalytic converter replaced at a local mechanic. Less than 24 hours later my car engine will no longer kick on, the red triangle of death as well as every other warning light on the car popped up, it shows the battery is drained even though it was perfectly fine before, and the fuel indicator is flashing on and off but there is gas in the car. I was told that the 12v battery needed replaced, so i took it to Auto Zone and they did say the battery is bad, so i spent $260 and bought a new one. Installed the new 12v and the car kicked on, drove forward a bit and then again wouldnt kick back on after i turned it off and back on. I borrowed a little code reader and got a U0100 code on it. My dad drove an hour and messed with it and couldnt figure it out. He just came back today again with a bigger computer code reader and was messing with it for over an hour. Every thing has come back as being in working order/healthy on the car, the only thing that failed was the ABS. But the car engine needs to be running for that, my dad said. He cant figure it out. He reset the car a few time, it would work for a second, but then not drive again and the codes are still up on the dashboard. This Prius has done this one other time my dad said, and its when he replaced the wheel bearing. He had to have his friend come over with the computer he used today, and reset the Prius and then it was fine. This time its not working. This is a 2007 Prius with 100k miles on it. Ive owned it for a month (literally got to drive it for 2 weeks before the cat was stolen), before i owned it my dad owned it and didnt drive it much at all, and the first owner was an elderly man where the car was maintained and in a garage. The Hybrid battery still had a little over half life left. My dad honestly thinks its something really simple, but he said its beyond his knowledge for him to figure out. What is going on, and can I fix it myself?