Octy 2 1.4TSI ESTATE CAXA

Quite uncertain where to enter this question. The keyfob#1 has started to cause serious problems with the car alarm system. So far keyfob#2 is working with no problem. Car alarm starting randomly and only disconnecting the battery helped. Yesterday the alarm kept sounding/flashing even when the engine was running - undrivable.

Is there a home cure whereby I can remap/reset the key fob? My very helpful auto sparks is unable to help

I would suggest that your problem is not with the key fob, but with the alarm system itself - if the fob is disengaging the immobiliser to allow the engine to start, this suggests to me that the fob is working correctly.

Disconnecting the vehicle battery should not stop the alarm, as it has a self-contained, internal battery.

Thank you Warrior183.

12 hours ago, Warrior193 said:

Disconnecting the vehicle battery should not stop the alarm,

as it has a self-contained, internal battery.

No does not make it stop, it will keep sounding till the battery of the alarm drained.

That's why there is a key hole in the side of the alarm's box and a set of 2 keys provided after the alarm installation.

I think that the battery inside the alarm is Li-ion and lasts many-many years.

^^^ & it has been in the car for 16 years now if the car is a 2010 Octavia which is 'many'.

Mine is in the alarm for 25 years and still working.

@D.FYLAKTOS Different alarm, in a different model and in a different environment / climate. So maybe someone with similar to the op in a similar location can comment on their alarm battery life. Not exactly an unknown issue!

Edited 8 hours ago8 hr by Evolution13

So it's time for a competition "who's alarm battery lasts longer from which brand-model and which location-enviroment temperature".

This will take some years to complete...

@D.FYLAKTOS Just relevant if the Mk2 Octavia Siren Battery might be more like a Mk2 Fabia's which might be as low as 8 years & needing replaced or 16 years old and still not as issue. The Alarm Siren showed in the Service Book as a replacement item at 5 years. Skoda / VW Group were the ones publishing the @ 5 year crap. & replacing whole units. You would have thought that they would know that they had fitted ones to cars already that were going to be good for 25 years.,,,,,,,,,,,,

Edited 4 hours ago4 hr by Evolution13

OK, "case closed" otherwise the @somean49 thread will ruined.

I would recommend buying a new alarm unit as others have found that the secondhand units have come from old crushed cars sources or other sources and only last a short time.

Once you start to have alarms at random, you will not be popular with your neighbours. The internal battery is NiMH and cannot be replaced by a LiPo or Li-ion battery.

See also the sticky posts above these threads.

Both my old Octavia and old Seat which I keep for parts had random alarms going off. Finally narrowed it down to when the car battery is getting low on voltage it seems to trigger alarm. Similar to alarm going off if you remove battery when alarm is on. Check the voltage on your battery in case its the same.

Alasdair

Edited 3 hours ago3 hr by Alasdair1