I have had several fault code issues recently including door open when it wasn't, side airbag faulty when it wasn't. They have been reset and not reappeared for a few weeks, but I have now received faults 4212 glow plug cylinder 1, 4262 glow plug cylinder 6 and 4548 or 4568 power management closed circuit current violation, and high level of battery discharge. The latter seems to come on when I first start to the car up. I sometimes leave the car for up to 2 weeks without driving it, but will then give it a motorway run. I have tested the battery while running with the lights, air con, radio on, and it reads 13-14 volts. I have seen another thread stating that this could be the battery is on its way out. Can anyone shed any light on this please.