First off, thank you in advance. I know the basics and then some about cars but I'm no mechanic and I do most of my own work in friends' garages.

I have a 1994 Nissan Altima with the KA24de engine. First off, I was trying to put on a cold air intake which I ended up remounting the stock air filter housing back on because it wouldn't work with the mass air flow sensor not on and my intake wouldn't fit on the sensor. I gave up and relised it wouldn't be worth it anyways since it is kind of a cold air intake with the tube running from behind the head light and under the car.

After that, we tried to take off my heat shield and ended up trying to cut it off because we couldn't get at the O2 sensor to take it off. We cut most of the heat shield off and my friend accidentally hit my O2 sensor and severed the wire a little bit. The heat shield is still on and we left it like that at this point.

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