Ignition light disco

[Andy_B]

Hi all.

I have a 2019 S3 that is giving me an ignition light funky disco  from time to time. The ignituon lights stay on or flicker even with the engine running.

Sometimes the dash goes blank and gives me "Ignition powered off" or similar and, according to my better half to whom it has just happened, the heater fan goes off.

It will start and drive as normal and has occurred while driving.

I don't know if its related but each time I start the car the rear occupancy/outside temp display, which are at the same location on the dash, flicker between the two displays.

I have had the car since September and its happened 3 times including today.

Any suggestions welcome.

Thanks

Andy

[cliffcoggin]

The prime candidate to my mind is a dying battery. The recent cold weather is revealing the weaknesses of all batteries. If it is the original five year old battery I would not hesitate to change it; if it is more recent I suggest you get it professionally tested before buying a new one. Make sure you get any new battery coded to the car.

[Andy_B]

Ok thanks. It's not something I would have considered as it starts on the button.

I have a decent tester so I'll give it a try.

Edited Thursday at 08:23 PM by Andy_B

[cliffcoggin]

The ability of a battery to crank the engine is not proof that it is in good condition.

[Telsown]

I concur Clifford,

Having recently purchased a new battery I did have some teething problems which I later found out was to do with the battery not being fully charged. With hindsight I should not have assumed a new battery would be fully charged, quite the opposite in fact and perhaps good practise is to fully charge a new battery no matter what!

I do recommend the CTEK MXS 10. Although pricey, I feel its about the best for any battery that you would ever own.

Terry

[Andy_B]

Ok, here's battery test results

Battery is date coded 06/23. Temperature was zero degrees. The car had covered a 25 mile journey at 10.30pm the previous evening and the test was at about 10am.

2nd pic is test before starting

3rd is test with engine running (I think 🤔)

4th and fifth self explanatory.

No idea if this tells anyone anything but happy to consider any suggestions.

Car will be left until Thursday evening and I will repeat the test.

Andy