Hi all. Sorry to bother you guys with this but I have a mk2 vrs tsi and the battery keeps dieing on me.

I have replaced the battery 

I have replaced the body control module after a michanic says that will be the problem. And I got it coded at skoda and its still the same also don't have a clue on what I might be. 

 

Put my factory head unit back in and the only fault codes comes up for it is this 

 

It says about headlight washers and heated seats. My car does not come with them from Factory. 

 

Any suggestions on what this fault might be and a remody on how to fix it will be much appreciated 

 

I have posted a picture of the fault codes below 

 

Thanks in advance 

 

Steffan 

The most common causes of battery drain are faulty alarms, aftermarket headunits and dash cams left plugged in.

 

You've already confirmed the first two, you have an alarm internal sensor fault and a siren fault. The latter is probably the battery inside the siren.

 

The second is the aftermaket radio headunit.

 

Do you have access to a multimeter? You first need to wait until the car has properly shutdown and test at the main battery for excessive power draw.

 

Does the alarm work?

 

Has the battery gone flat after removing the non-standard headunit?

 

The 12V accessory sockets on the MkII Octavia are permanently live, do you have anything plugged in?

My alarm has never worked since I baught the car 3 years ago. This has only been going on as I took it off the road over the winter. 

 

Ye I have a multy meter but I only know how to check voltage and a aultinator test. 

I have nothing plugged into the 12v socket 

I'm not an expert either, but measuring the current draw from the battery with the car in sleep mode should be the first step.

 

A lot of systems and modules stay active, consuming power after the car is turned off and locked, opening a door wakes some of them up too, so it can be difficult gaining access to the battery and being confident the car is asleep.

 

If you're able to confirm the car is drawing excessive load from the battery whilst asleep then next comes the difficult part, finding out what is sucking the battery dry.

 

If however there is no excessive draw then it might simply be a poor battery. Remember the current draw could be intermittent so several checks might be required over a number of days or weeks.

 

Checking for the excessive draw varies from car to car but you could start in the fuse box testing each fuse in turn, again being sure the car is definitely asleep.

 

Personally I'd be looking to your mechanic for some support. He has incorrectly diagnosed the BCM,  a relatively expensive component replaced unnecessarily. I can't imagine the coding of the BCM at a Skoda main dealer was particularly cheap either?

 

Given that you're already a few hundred pounds down I'd either be asking your mechanic for some money back and/or taking it to a proper auto electrician.

I was lucky with the main dealer as my dad workes at a seat dealer which had a skoda next door. 

He asked 1 of the techs to do it on his spare time on a sat. Il give it a try today 

 

Thanks for the advice 

Another thought based on symptoms and not experience, is that due to the car being laid up for a while, and assuming you removed the main battery during lay-up, the alarm battery had totally discharged and has finally failed.

With the main battery reconnected, it could be constantly trying to recharge the (failed) battery in the alarm. 

Agree that possible suggestion. A easy thing to try temprarily disconnect the faulty alarm siren module and see if the problem is resolved.

 

Be aware, if the car is stolen or broken in with a inoperative or disconnected alarm there may be grounds for the insurer to refuse claims. 

^^^ But the op says his alarm hasn't worked for 3 years. I kind of guess it is dead already............

Depends by what he means by hasn't worked along with the internal sensor fault. It may have not been the alarm that was faulty three years ago. And after 3 years the damage inside the alarm module could have worsened if the cells have leaked...  It's not a 100% diagnosis but an easy one to try.

Il give it a try