You might want to look at the sticky at the top of this section.
I don't know why you think an 02 sensor means a bad 02 sensor.
Hatch struts become weak in the cold.
The headliners are starting to sag.
Lower and raise the windows. Look to see that there is no bulge in the door panel. These cars have window regulator problems, but it's fixable.
If it has the M-tech package it's a Sport. You should have sport seats too.
The front bumper looks like a lux M3. The rear has a black valence.
Wheels should be 16" 5 spokers.
Why would you want to rebuild the motor?
They are very reliable. Just keep an eye on the radiator.
If you had to rebuild a motor you'd be better off doing a swap anyway.