My mechanic buddy has this one and it works awesome lol hes had it for yearsss. http://www.amazon.com/OTC-5609-Cylinder-Leakage-Tester/dp/B0030EVL60/ref=sr_1_1?ie=UTF8&qid=1401573288&sr=8-1&keyword...
That was what I had to do. I was like... WTF??!?!?!! So I took the sensor out, and it was a bitch to put back in because it seemed like every wrench I had was too damn big to tighten the sensor.
Added 2nd puller fan and nismo t-stat to keep things cool.
changed knock sensor. (eliminated ks code)
cleaned idle air control motor
flushed brake fluid