Hi there,
I think thats quite some bad news if the red key doesnt fit the locks. Why?
To start off with, it is only Fiat that can reproduce another key for the car. The standard key incorporates the Fiat Code which is read by the ECU milliseconds before the car fires up. Now the red key(which os called the Master Key) is there to be used only in the case that you need to make some spare keys, whereby your specific Fiat Code which is read from the red key and is copied into the new everyday key. Infact the manual states that if you lose the red key and need to cut new spare keys the only way out is to renew all door locks, starter lock and you will also need a new Fiat Code programmed into your system.
Check this out:
After two weeks of Bravo ownership I had sh*t. By accident my keys fell into a pile of dust and mud and I didnt clean it properly. When I tried to start the engine, fuel was cut off and car couldnt fire up. I didnt no what the cause was, so you can imagine my panic just after two weeks ownership. After alot of brainstorming, I swapped the key with a spare one (luckily I was at home)and I off I went. After cleaning up the other key properly it worked ok.