walsaadi

I'm driving Q7 07 replace the battery in the winter but I didn't have the vag-com at that time to change the serial number or change codes , I wonder if this is the reason the battery is not lasting for more than 2 days now ? The indicator goes down to one bar and the trunk won't open but the car start normal

NorthernQ7

Yes this could potentially have killed your battery, as old batteries are charged more than new ones (your car was still thinking it had an old battery).
The car will shut off non necessary systems (as the power trunk and AMI) when the power is low.

snagitseven

The battery is more than liklely just fine. Because you didn't recode for the new one, the ECU thinks the battery is still low so it is acting accordingly to preserve power. If you don't have access to a VCDS, you can either bring the car in to the dealer to have it recoded or wait awhile - the ECU usually will eventually self-calibrate to the new battery.

walsaadi

Thank you for your replay , I have the new vag_cam mobile from ross_tech but I don't know how to change the code any help will be appreciated.

Jusforfun

The most likely cause of your battery drain is faulty door lock or locks. They remain active after locking up. They are supposed to power down after thirty seconds. Later production do not have this problem.
It is common for the tailgate motor to stop functioning as part of the battery power save mode as will courtesy lights. Its just to leave you enough power to start up.
I generally leave mine unlocked to avoid this problem as I am out of warranty. My battery is still the original after 8 years.

walsaadi

Justforfun ... I noticed that I cannot lock my car from the passenger's handle black button and when I run a full check this is what I got ,

Address 05: Acc/Start Auth. Labels: 4F0-910-852.clb
Part No SW: 4F0 910 852 HW: 4L0907335
Component: FBSAUDIC6 ELV H31 0210
Revision: 27120501 Serial Number: 10601000480992
Coding: 0000135
Shop #: WSC 31414 790 00001
VCID: E389BC8F706F285CA0F1D4-80B6

Subsystem 1 - Part No SW: 4F0-910-131-L
Component: FBSAUDIC6 EZS H45 0080

Subsystem 2 - Part No SW: 4F0-910-335
Component: FBSAUDIC6 KSG H27 0080

7 Faults Found:
00191 - Passenger's Door Handle Touch Sensor (G416)
011 - Open Circuit

00191 - Passenger's Door Handle Touch Sensor (G416)
007 - Short to Ground

02764 - Access/Start Authorization Switch (E408)
008 - Implausible Signal - Intermittent

00193 - Right Rear Door Handle Touch Sensor (G418)
007 - Short to Ground - Intermittent

00955 - Key 1
002 - Lower Limit Exceeded - Intermittent

00193 - Right Rear Door Handle Touch Sensor (G418)
011 - Open Circuit - Intermittent

00956 - Key 2
002 - Lower Limit Exceeded - Intermittent

I just got the vag-com and I don't really know how to use it

NorthernQ7

Really common problem, I have the same problem. Solution is to replace the door handle / sensor. (Not relevant to this thread though..)

walsaadi

Do you have the steps to how access and replace the sensor and the parts needed. Thank you