Yes I made sure every thing was snugged and capped down. I didn't have obm diagnosis gadget with me so I just took the positive battery cable off. Check engine light still appeared. The next day I de-greased the the motor, washed her and when I got back in my car the check engine light was off. So I took it to get smogged (I just bought the car and it failed. I used my obm diagnostic gadget code P0301 appeared. so I just now cleared the codes and I was told to drive 70 miles so the computer would re-set and recycle. whatcha thinking