My remote keys only work on doors not engine start

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If your remote keys are only working on the doors but not starting the engine, there could be several possible causes. Here are a few things to check:

1. Battery in the Key Fob: The battery in your key fob might be low. Try replacing it with a new one.

2. Key Fob Programming: The key fob might need to be reprogrammed. Sometimes, the programming can get corrupted, or the key can lose synchronization with the car's security system.

3. Ignition System Issues: There could be an issue with the car's ignition system. It might not be recognizing the key fob. This can sometimes be due to a problem with the transponder chip in the key or an issue with the car's immobilizer system.

4. Keyless Start System: If your car has a keyless start system, the issue might be with the push-button start system itself.

5. Signal Interference: There might be interference causing the signal from the key fob to be weak or blocked.

6. Car Battery: If the car battery is low or dead, it might affect the keyless start system.

Steps to Troubleshoot

1. Replace the Key Fob Battery: Start with the simplest solution and replace the battery in your key fob.

2. Use a Spare Key: If you have a spare key, try using it to see if the problem persists. This can help determine if the issue is with the key fob or the car.

3. Reprogram the Key Fob: Refer to your car's manual for instructions on how to reprogram the key fob. This process varies by make and model.

4. Check for Interference: Move the key fob closer to the car or try in a different location to rule out signal interference.

5. Consult a Professional: If none of these steps work, it might be best to consult with a professional mechanic or visit your car dealership. They can diagnose and fix issues related to the key fob and ignition system.

If you can provide more details about your car's make, model, and year, I might be able to offer more specific advice.