It may be because your battery is too old and it has served its maximum usable life.
or
If you are having a new battery but still facing the same problem contact the vendor, the battery may not be original or it may be faulty.
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disconnect the baqttery negative with the key on.. then shut off the key and reconnect the battery.. then turn the key to the run position for a few seconds to reset the coputer.. see if that works.. if not check the battery to make sure its good.. alarms will sound if voltage is low..sould be at least 12.6 without the car running..
The fact the battery is 3 months old means zip, I have replaced dozens of batteries under warranty, many less than 3 months old. have it tested with a load tester.
Just curious, do you have a copied key or original......as it might be losing it's code or the baqttery might be going flat in the immobiliser remote ?????
Connect the charger to the terminals on the baqttery not the cable ends. This will ensure a good connection. If battery still does not charge fully, replace it, clean the cable ends before attaching them. Then put a volt meter on the battery and check that charging system is putting out at least 13.5v a little more is ok, With accessories on including high beams lowest reading should be 12.75 and not drop even after five or ten minutes. Jumping across a bad battery will often prevent enough power to the starter, If still in no-start with new battery starter may also have failed.(but will need testing to verify.
The CMOS error is caused by a dead motherboard battery. There is a small battery on the motherboard Usually a 2032 battery. The dead motherboard battery could also cause the Invalid system disk because a dead motherboard battery will also cause the motherboard to lose the Hard drive settings.
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