Sensor

Hi guys, I have D15B SOHC VTEC engine. I got problem with my check engine light on. I checked the code and it is 9 which is Cylinder Sensor. Can anyone tell me the location of this sensor and what is the function. And how to overcome to this problem.
Thanks.

it just could be ur map sensor or knock sensor cuzz jdm doenst have one

need help on my d15b on my 97 hb. vtec doesnt kick in im thinking the problem is my ecu cuzz im running obd2 and wire shuld be obd1 wat do u think any help would be great