Quote Originally Posted by landlord View Post
Very curious lang ako. What happens if I try to start our 2008 Honda City using the 3rd spare key. I was told that this key is only for the door and cannot start the car. And that if " pinilit " to start the engine, the car would lock down as it would assume that it is being carjacked using an unauthorized key. Is this true? Thank you in advance.
That would be the engine immobilizer working. It's an anti-theft measure.

On a car with an engine immobilizer, the original keys should contain a chip inside the "blade" of the key itself, usually near the fob. This chip gets read by the immobilizer in the ignition switch and allows you to crank the car's engine.

If you duplicated an immobilizer-equipped car key, it should go into the doors and ignition just fine, but it won't crank the car to life. It's missing the immobilizer chip of the original key.