95 240sx unknown wire by the passanger fendor

[sebastianwrx]

hi i just bought my 240sx 2 days ago and the car have CEL in it that i dont know..my friend checked it and he said something that 1 of the sensor need to be clean....and today i checked the engine bay and found this unknown wire that it happens by the passanger fendor..please let me know wht this wire for and where to connect them...thanks alot

http://i224.photobucket.com/albums/dd288/wrxsebastian/DSC00261.jpg
http://i224.photobucket.com/albums/dd288/wrxsebastian/DSC00260.jpg