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HOW TO START THE MAZDA 3 WITH A BROKEN OR DEAD KEY
Now that you've managed to enter the vehicle with the auxiliary key, you're going to need to know how to start your Mazda 3. At this point, the auxiliary key can be put back into the key fob, as the key fob can still be used to start your vehicle. This will only take a few extra steps.
Make sure the shifter is in the Park (P) or Neutral (N) position.
Depress the brake pedal.
The light on the engine start button should flash green.
Take your key fob and touch the back of it to the push button start.
When the green light on the engine start button stops flashing and remains continuously illuminated, press the push button start normally to start the engine.
It is recommended you allow the vehicle to idle for about 10 seconds.
there is often a small back up battery in the immobiliser unit itself, if you can locate this unit and replace the battery with the ignition on / engine running, then it should not need recoding and work fine after that. The other thing that could be wrong is the key battery (if the fob has one) or the transponder chip in the key head. If the key signal is low the immobiliser lamp will light during driving, but this does not explain the alarm going off. That is more likely either a poor vehicle battery, alarm / immobiliser back up battery, or another electrical fault such as water leakage into a tail-light or even the alarm unit itself when it rains. A lot of alarms are voltage sensing and when the vehicle is parked they will alarm if the battery voltage changes for any reason, though not during driving so the battery in the immob is my first choice to look at.
Sounds like you have an aftermarket alarm with starter disable. By disconnecting the battery the alarm reset and the defualt setting is usually to set the alarm automatically (active arming). You have three options.. A. If you have the key fob that went with the alarm you can disarm the alarm. B. If no key fob is available you can disconnect the battery again, turn the ignition key to the on position and reconnect the battery. This usually doesn't allow the alarm to set and allows the car to start. C. Remove the aftermarket alarm system. This is usually the long term fix i recommend if the fob isn't available. Option B should get you going though.