What Causes a Spare Key to Fail in Opening the Car Door?

2 Answers
DeConnor
07/29/25 7:26pm
Car spare key fails to open the door due to a dead remote key battery, a depleted car battery, or strong signal interference in the vicinity. You can use the hidden mechanical key inside the spare key to open the door. If the mechanical key also fails to open the door, it indicates a door lock malfunction. Additional information about the car's smart key system is as follows: 1. Keyless Entry Function: When the key approaches the vehicle, the door automatically unlocks and the anti-theft alarm is deactivated, accompanied by the turn signals flashing twice. When the key moves away from the vehicle, the door automatically locks and the anti-theft alarm is activated, with the turn signals flashing once and the horn sounding briefly. 2. Automatic Window Closing and Security Function: When the key is 3-5 meters away from the vehicle, the door automatically locks and the anti-theft alarm is activated, with the turn signals flashing once and the horn sounding briefly.
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VanBella
08/14/25 2:14pm
Speaking of spare keys not opening car doors, I've experienced this quite a few times. The key itself might be too worn out, especially since spare keys are usually kept in bags or drawers where they can get scraped by other items, causing the edges to flatten and making it impossible to turn when inserted into the lock. The lock could be rusted or jammed with debris, like dust or small stones stuck inside. I remember once after rain when it was humid, a bit of rust formed inside the lock cylinder, and the key just wouldn't turn no matter what. Also, if the car has been used for a long time, the lock mechanism might have aged or deformed, making it incompatible with the new key. In such cases, don’t force it to avoid breaking the key or damaging the lock. Try gently spraying some lubricant, like graphite powder, into the lock or have a mechanic take a look. Regularly test your spare key to ensure it works—prevention is better than cure.
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