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While it's not possible to deactivate the immobilizer feature in the Mazda6 according to the manufacturer's intention as detailed in the service manual, there are potential solutions if you're having trouble starting your car due to the anti-theft system. If your key FOB is not working, it may be due to a depleted lithium battery. If you have a spare battery, replace it and see if the immobilizer is disengaged once the key sends the proper signal. Alternatively, testing another key FOB could be an option. Another option is to use the vehicle's code card to engage the ignition and input the code using the buttons on the steering column to bypass the immobilizer and start your car.
To reactivate the immobilizer on your Mazda 6, ensure the key is close enough to transmit the signal. Turn off the ignition, then start the engine again. If the engine doesn't start after 3 tries, reach out to a Mazda Dealer. If the safety light stays on while driving, avoid shutting off the engine.