ok so i opened up my air box and i put that universal filter on just like the "how to" in colbaltss.net forum said to. Now after 3 days my cel light came on and i pulled the codes. p0171- system to lean bank 1 and p0603- keep alive memory. I just want to know how an air filter would make a cel light come on. Am i going to have to put tthe bottom of the air box back on with the stock filter?