So my check engine light came on, code P0170 System too lean (Bank 1). I checked all of the vaccum hoses and what not, found nothing wrong, and the car is still running exactly the same. I went ahead and cleared the code to see if it would come back on, and it has not. Most likely is nothing wrong? Or does it take longer than a day for the check engine light to come back on? Should I not have cleared it?