my car is showing code 23 on the ecu its a knock sensor code i cant see anything unplugged really and i was told it could be the knock sensor itself but when i first start my car the check engine light dosnt come on but then like a minute later it does. so does that mean that it is in fact my knock sensor or could it be the wiring and when the car starts to idle right then the ecu sends the code and thats why the check engine light comes on please lmk what you think asap please thanx a million.