How to Say "ignition key" in Spanish
The Spanish word for “ignition key” is “llave” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
NounA1
for starting a car

Examples
Perdí la llave de mi casa y no puedo entrar.
I lost my house key and I can't get in.
Por favor, pon la llave en el contacto para arrancar el coche.
Please, put the key in the ignition to start the car.
It's a Feminine Noun
Even though it doesn't end in '-a', 'llave' is a feminine word. So, you always say 'la llave' (the key) or 'una llave' (a key).
'Llave' vs. 'Clave'
Mistake: “Necesito la clave para la puerta.”
Correction: Necesito la llave para la puerta. Use 'llave' for a physical object that opens a lock. 'Clave' is for a password, code, or an abstract 'key' to understanding something.
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