This is typically associated with a power discharge in the PPeugeot 207 post control system. You need to buy the battery CR1620 (3B). You can open the remote by using the usual coin as a lever, and a special paz is provided in the end of the log. After replacing, you must initialize the key by doing the following:
-Insert the key into the ignition locking system and move it to position II;
-Push the door lock button and hold it for 5 to 10 seconds.
-Turn it back and take out the key.
If initialization did not solve the problem, the cause can be covered in microfractures on the remote board. In this case, a replacement is required.