I was driving to work two days ago and the engine shut off when I was on the road. When I tried to start it, the engine would start but shut off in a second. I had to get the car towed to a mechanic my friend thinks is pretty good. He said the camshaft sensors were malfunctioning and replaced both sensors. He also went ahead and replaced the air filter and cleaned the throttle body and MAF (I wasn't there when he did the work as I had to leave for work).

Yesterday, I went to the mechanic to get the car as he told me it was fixed. The car ran fine while we were test driving, but the engine was stuttering a bit when the car was stopped. He said it is not unusual and the the car should be completely fine by tomorrow. He charged me $420 for everything, which I think is pretty steep.

Anyways, I brought the car home and it ran just fine. A couple hours later, I had to go to the pharmacy and when I stopped at the pharmacy parking, the engine shut off just like it did before. I thought I was getting paranoid as the car started just fine when I turned the ignition.

A couple hours later, I went to Tim Horton's and the engine shut off while I was placing my order. This time, the aftermarket navigation system displayed my battery is running low when I started the car.

Now the car shuts off in a minute if I don't pump the gas pedal. I am confused what is wrong with it. I didn't get the low battery message again and there's nothing in the dash other than the service engine soon light.

The car is 2005 G35x with 142k Km.

I have uploaded a video so you guys can see.

 

You need to pull the code that caused the SES and go from there. My guess is your crankshaft sensor is bad.