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If your fiat 500 stolen without keys Key Cover Fiat 500 fob fails to function Try a different one to see if your car will detect it. If it does, then the issue is likely with the original fob's battery or water damage.
Replace the battery first. Make sure that the new coin cell battery is properly inserted with the "+" side facing down inside the fob.
Dead Battery
The battery is often the cause of an inoperative fob. It's a simple fix Most fobs give you a warning if the battery is in low. You can find the correct procedure on YouTube for almost any car's key fob or look in your owner's manual. You can also replace it by taking it to an authorized locksmith or a dealer who supplied it to you.
Sometimes, a fob won't working due to a problem on the internal circuit board. It is rare however, it can occur. If you drop the fob on a hard object, it can damage the internal chip. It could also happen if you use an aftermarket fob, and the key doesn't work.