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battery went flat, now won’t start, bump or jump, o have two keys not sure which is which and the red warning light of a car with a key inside flashes when I try to turn turn over, no click or lights or anything,
Hi, Seems as though the immobilizer is preventing your car from starting. Try the following if you can: Remove both battery cables from the battery for at least 5+ minutes. (Remember which cable goes where, also do not have the key in the ignition when you do this - that way you cannot accidentally turn on the engine when you are working in the engine bay). Charge the battery in the meantime by connecting it to another battery or charger. Be careful where all the cables are, do not short any together. By removing the battery connection from the car hopefully this will ‘reset’ the immobilizer. This is the light (car+key inside) that is flashing in the dash. Once you think that the battery has enough charge to start the car, disconnect the charger (or battery that is charging the battery) reconnect the battery cables, ensure that they are securely fastened. Then try and start the car with the key. Not sure what you mean when you say that you have two keys but not sure which is which. Do they look the same? Do they both fit into the ignition and turn the ignition lock? With a lot of immobilizer systems the light in the dash goes out when the correct key (a fob key) is inserted into the ignition. If the car starts suggest you find out why the battery went flat . If you have a DMM (Digital Multimeter _ Voltmeter function) connect it across the battery terminals with the engine running (be careful when you do this be very aware that the motor is running. Watch out for moving parts. You should read at least 13.8V DC with the meter. Anything less than this means that you are not charging the battery with the alternator. Take the vehicle to an auto electrician or a Nissan dealer to get it checked out.
