- Make sure the key is properly programmed. The new key must be programmed to match the security system in your car. This is usually done by the dealership or a qualified locksmith.
- Check the battery in the key. If the battery in the key is dead or low, it may not be able to transmit the signal to the car's ignition.
- Try using the old key again. If the old key still works, it may be a problem with the new key itself. You can try using the old key to start the car and see if it works consistently.
- Have the car's ignition system checked. If none of the above suggestions work, there may be a problem with the car's ignition system itself. You can have the car towed to a qualified mechanic or auto electrician for further diagnosis and repair.
It's important to note that working on a car's security system can be complex and potentially dangerous, so it's always best to consult with a professional if you are unsure about any of these steps.