my idea is starting to become a prime choice........
or if you are very careful and good aim, hit the o2 sensor with a hammer. the best way it to hit it from the top (yeah i know virtually impossible while exhaust is mounted on the car) but, that leads me to the next part, remove the exhaust then try
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming