Key fob not working after a battery change

Check these first

1. Open the fob again and make sure the battery faces the right way. Most fobs want the + side facing up, toward the cover marked +.
2. Compare the code on the new cell with the old one. A CR2025 or CR2016 in place of a CR2032 is thinner and may not touch the contacts.
3. Remove any clear sticker or plastic film from the new battery.
4. Look at the metal contacts. If one was bent while you pried the case open, gently bend it back so it presses on the cell.
5. Check that the rubber button pad sits flat and every button lines up with its hole.
6. Press the two halves of the case together until they click shut all the way around.

If it still does not work

• Test the new battery. Old stock can be weak straight out of the pack.
• Try the spare fob. If it works, the problem is in the first fob, not the car.
• Most fobs keep their programming when the battery is changed. A few older remotes need a resync procedure, which is described in the owner's manual.
• If none of this helps, the fob itself may be damaged. A dealer or locksmith can test it.