i have a first get b16 and pr3 ecu. its thoughing a code 23, knock sensor. i have searched for a good picture but i didnt find one. if anyone has a good pic of where it is so i can find mine. i know its under the intake man. but theres a couple of things back there that look like they could be it i just dont know which one.

 

there are 3 things down there(as I remeber)
1)temp switch...two round connections
2)oil pressure signal....one round connections
3)knock.....one flat connection

the connections Im talking bout are with the sensors unpluged

 

ok cool thanks dawg, that helps. but you dont happen to have a pic or digram do ya??

 

the knock sensor is on the back side of the short block facing the firewall.

If you were to reach under the intake manifold, the sensor would be located 'just' under the head gasket and towards the middle of the block. It only has one wire plugged into the sensor.