The other day and it was very cold, -25C, my versa would nor restart after a stop at the ATM. It turns out there is trouble with the throttle actuator and 2 codes were set, P2101 and P2100. After waiting for an hour or 2 the car started but was showing 'service engine soon" on the dash. What I never knew is there is no mechanical link to the throttle..its by wire! A friend cleared the code with his scanner and so far the problem has not come back. What should I do? 