The car i think has a pr4 ecu, its ob0.. the car is throwing a code 23, which is the knock sensor

if you just start the car whether it be after its been sitting a night or sitting an hour, the check engine light is off....

But after you go to gun it, and let off, the check enginel light comes on and its a code 23, the car starts running pretty crappy ( horrible gas mileage to, like my friend filled up like 6 times in the last 4 days, the car didnt come vtec and the the person that wired it up before him had the vtec solenoid in the pressure switch slot and vise versa.. so we checked the knock sensor wire, and that was in the right spot..


Now, i dont think the sensors bad, if it only does it after u gun it? so maybe the car is actually knocking?