I have a 307 Peugeot car and the car key 2 button blip had become damaged so I ordered a case replacement on ebay. I took the older casing off and replaced with new casing and found that the locking/unlocking worked OK. When I tried the key to start the car it would turn the starter motor over but would not fire the engine. After trying to understand why it would not fire the engine I then replaced half of the casing which had the Peugeot Lion on with the new 2 button casing and everything then worked ok, but I cannot understand why?