Hi guys and sorry for this long post. My friend has an 04 Xterra and we were fixing a coolant leak that was under the intake plenum so the plenum had to come off. Well it was getting late and I decided to finish the job the next day. We had to move the car forward so the battery was hooked up and I told him to put it in neutral. When he turned the key he said he heard a clicking noise and the check engine started blinking. Well the next day we finished the job and I noticed that I didn't have the ground that gets connected to the top of the plenum on when we turned the key the night before. Well now the car won't start, has no spark and if we connect a scanner to the obdll port it says that it cannot connect with the car to read it. I need help. Anybody have any ideas?