An automatic transmission (AT) selector lever lock is a device that prevents the selector lever from moving from the Park position to another position unless the brake is applied.

Purpose and principle of operation:

* Ensure safety: The lock ensures that the vehicle will not move when it is parked, even if the gear shift lever is accidentally moved from the Park position.
* Convenience: The lock releases automatically when the brake pedal is pressed, allowing the driver to easily change gears without releasing the brake.

Types of blockers:

* Mechanical: The selector lever is locked by a physical mechanism that is released when the brake is applied.
* Electronic: The lock is controlled by an electronic module, which receives a signal from the brake pedal and activates/deactivates the lock.

Location and installation:

The automatic transmission selector lock is usually installed on the steering column or center console of the car. Its installation is relatively simple and can be done by a qualified mechanic.

Troubleshooting:

If the selector lock does not work properly, the following problems may occur:

* Inability to change gear from Park position.
* Inability to start the engine even if the gear shift lever is in the “Park” position.

A faulty shift lock usually requires repair or replacement.

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