hello,i am new to this but need help,i have a 2001 a4 2.5tdi quattro.couple of months ago battery went dead,bought new battery.all was well for a couple of weeks then battery would die again,threw on jump leads,started fine.recharged battery but charge would last anywhere from 3 days to 2 wweks before dying again,i had esp light on for a few months before this and wasn't sure if this would contribute.recently got a 2nd hand steering angle sensor and that fixed esp problem.got another new battery 4 weeks ago,still working although been a little sluggish to start a few mornings.noticed a few nights ago that the hazard warning light in dash was illuminated after car was locked.opened car and re-locked it,stood watching for a few minutes.the light would stay on for around 30 secs like it should then go off.then would illuminate intermittently off and on while car was locked.wondering if ccm could be responsible for battery drain,maybe not shutting down properly?couple of years ago we did have the common plenum chamber problem,cost us £800 to fix.back then the drivers footwell was getting wet, also noticed the ecu box under bonnet/drivers side was cracked,letting water in,fixed now.any suggestions welcome please.