For safety and security -> Engine immobilizer system for Your Toyota Aygo SUV Second Generation (2015-2021)

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Engine immobilizer system  
The vehicle’s keys have built-in transponder chips that prevent  
the engine from starting if a key has not been previously regis-  
tered in the vehicle’s on-board computer.  
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Never leave the keys inside the vehicle when you leave the vehi-  
cle.  
This system is designed to help prevent vehicle theft but does  
not guarantee absolute security against all vehicle thefts.  
Vehicles without a smart entry & start system  
The system begins operating after the engine switch is turned from  
the “ON” to the “LOCK” position.  
The system is canceled after the registered key has been inserted into  
the engine switch and turned to the “ON” position.  
Vehicles with a smart entry & start system  
The system begins operating after the engine switch has been turned  
off.  
The system is canceled after the engine switch has been turned to  
IGNITION ON mode.  
System maintenance  
The vehicle has a maintenance-free type engine immobilizer system.  
Conditions that may cause the system to malfunction  
If the grip portion of the key is in contact with a metallic object  
If the key is in close proximity to or touching a key to the security system  
(key with a built-in transponder chip) of another vehicle  
 
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Certifications for the engine immobilizer system  
Vehicles without a smart entry & start system  
 
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Vehicles with a smart entry & start system  
 
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NOTICE  
To ensure the system operates correctly  
Do not modify or remove the system. If modified or removed, the proper  
operation of the system cannot be guaranteed.