Will the VDC be affected by putting after markets parts for the suspension?

If the aftermarket parts are OEM style replacements I doubt there would be any issues.

Do you know anything about the o2 sensors? I need a bank 1 sensor 1, but the previous owner made it into a single exhaust.

Hopefully you still have the original cats and O2 sensors. There are probably a set of cats and oxygen sensors for both banks (sides) of the engine.

I don’t know too much about the cats. I have to look under the car to see if the 02 bank 1 sensor 2 is somewhere there. I thought these were connected to the exhaust. I saw a picture, and it looked like all four were near the exhaust pipes under the car, two on both side. I’ve seen sensors by the pipes, and some in the pipes.