Annoying battery drain killing car after just a few days unused

New battery so not the battery

 

One thing I am getting when car is turned off is a relay type noise (almost fizing noise) from under the bonnet 

 

As you look under the bonnet at the back right hand side it appears to be from under the plastic trims very close to the screen 

 

No idea what electrics are under there ? 

I have original satnav / stereo , no dash cams etc but any clues to look for would be helpful 

 

Thanks 

17 minutes ago, SkodaSuperb12 said:

No idea what electrics are under there ? 

Remove the trims and all will be revealed including hopefully the cycling relay, a good thwack often sets them straight like a defibrillator.

If you mean the right side as you look at it, rather than the car's right side, I think the air quality sensor may be under there, and they have a bad rep.

On 19/11/2023 at 20:37, J.R. said:

Remove the trims and all will be revealed including hopefully the cycling relay, a good thwack often sets them straight like a defibrillator.

Hi

Pls clarify what a cycling relay is ( I know what a relay is ) Thanks 

On 19/11/2023 at 20:42, Breezy_Pete said:

If you mean the right side as you look at it, rather than the car's right side, I think the air quality sensor may be under there, and they have a bad rep.

For draining batteries or making noises ? 

Ta 

Failing in a way that might cause a battery drain. Some reports of scorched connectors if I remember rightly. Possibly water ingress related?

A cycling relay is one where the contacts oscillate on and off making a chattering or buzzing noise, sounds similar to an AC door release on an intercom system when someone "buzzes" you in.

Thanks everyone , I will get to the bottom of this and report back 

Also, use a multimeter and measure power drain. Easiest is to get someone to read the multimeter while you unplug fuse by fuse from panel to check. There should not be any more powerdrain than maybe 20-30mA.