it is on back side towards rear end of engine.
back center of the block right above the oil pan it has 2 wires going to the one above it with one wire is the knock sensor
twin cam 2.4 liter
www.nada.com
Next to the oil filter
Next to the oil filter, bolted to the block.
on the rear exhaust manifold hard to get to
The 2002 Chevy Cavalier 02 sensor can be found attached to the air cleaner housing. The O2 sensor will be on the back side of the air cleaner housing.
Purple
Top middle of intake cam tower. Right there in front.
Trottle sensor...
The vehicle speed sensor is located in the transaxle housing at the rear section near the right driveaxle
didnt they stop making z24's in 2002-2003. and it requirs pull the motor apart