ok, i finally got the down pipe welded and the oil line taped. It sounds great when it spools. I am not running any boost yet, im still waiting for my intercooler and ecu chip. Problem is that now I get a CEL after driving random amounts of time. Every time I turn the car off, the CEL clears. How can I check what it thinks the problem is? Only things I have really messed with are the Oil Pressure sensor and the O2 sensor. Why would it throw a code after random driving times? How can i check the code?