Does removing the positive battery cable reset computer?
While disconnecting the battery is the most common method of resetting your computer, it’s not always the best way. That’s because disconnecting the car battery causes your computer to lose its memory. So, things like your preset radio stations, shift points, and your car’s ideal fuel/air mixture are forgotten.
Is it OK to just disconnect the positive terminal?
No, it won’t drain overnight if you disconnect the positive lead. However, it’s very bad practice & can be dangerous, assuming the car is negative earth/ground. NB: Just about every car built since about 1965 is negative Earth.
How do I Reset my Computer after replacing the battery?
One way to reset computer is by disconnecting your battery cable for 2 to 3 minutes and then waiting to check if the check engine light comes back on as you reconnect the battery then starting the car.
What can I do to reset my car battery?
Remove both battery cables (positive and negative) and then connect them together. You can do this with electrical tape, zip ties, or clamps. Keep the cables away from the battery terminals (using a bungee, you can “hang” them from the open hood as an option) and let them remain connected for at least half an hour.
What to do if your computer is stalling after replacing the battery?
If this doesn’t solve the problem, call your mechanic. You may have a more complex problem than just a computer with amnesia. Severe cases of stalling after replacing the battery may require that your throttle body or your idle air control valve  be cleaned out.
What should I do after changing the battery in my Volkswagen Passat?
After changing or disconnecting the battery Basically, you need to reboot the computer on my Jetta TDI 2006. Turn the key on, but don’t start it. If you have to jump it, leave the jump in place to run the computer Leave it with key on, but not started for about 15 minutes.