Stop/Start Fault workshop issues

[Madd]

About 2 months ago the stop/start fault code started appearing on my Audi A4 2017 dash, following this I booked an diagnostic with my local Audi Centre (Jardine Motors UK) for 29th July. Two weeks ago however I also got the brake servo error too, which I bought and replaced with a genuine part, clearing the error from my dash and fixing my brake pressure. When I've brought the car for a diagnostic however, the workshop has been adamant that the stop/start issue was due to the brake servo error still showing internally despite the fact my brake pressure was completely the norm and had cleared from my dash. Argued with a service manager for an hour about the brake servo not being an issue, and when they finally replaced the same exact VW part with the same one, initially trying to charge a full £170 for a cheap part that takes 3 minutes to change, the stop start issue still remained with them having the audacity to tell me the issue was already fixed despite the stop start error popping up straight away when I started it. Apologies for how long this is, but I would just like some advice regarding what I could argue. It just seems like a case of massive incompetence from their part, and refusal to acknowledge that it could be something else.

[Magnet]

Hello Daniel,

Thanks for joining and posting your plea.

Stop/start issues with a 5 year old vehicle? 
Typical battery issue, and possibly below par on the cold cranking current parameter. 
You could get the battery’s efficiency checked, but that check would need to be ‘sophisticated’ as opposed to a simple ‘% efficient’ test. 
If you are going to replace it:- I always buy Varta/Bosch (original equipment suppliers) but only to their 5 year warranty grade. I buy on line from specialists such as Battery Megastore, Tayna - and there are more. 
The battery will need to be coded to the car once fitted. 
Kind regards,

Gareth,

p.s. All above, assumes the battery is the original. 

[Madd]

2 hours ago, Magnet said:

Hello Daniel,

Thanks for joining and posting your plea.

Stop/start issues with a 5 year old vehicle? 
Typical battery issue, and possibly below par on the cold cranking current parameter. 
You could get the battery’s efficiency checked, but that check would need to be ‘sophisticated’ as opposed to a simple ‘% efficient’ test. 
If you are going to replace it:- I always buy Varta/Bosch (original equipment suppliers) but only to their 5 year warranty grade. I buy on line from specialists such as Battery Megastore, Tayna - and there are more. 
The battery will need to be coded to the car once fitted. 
Kind regards,

Gareth,

p.s. All above, assumes the battery is the original. 

Cheers for the advice, asked the technician to check this but apparently the battery is fine. Hes determined after 2 days its a problem between two antennas that are in the car and something to do with the wiring. Thank you for the suggestions though, especially as the battery advice will probably be needed soon with it being the original battery.

[Magnet]

Thanks Daniel, 

How much is 2 days out with a technician likely to cost I wonder? 
Followed with sorting out antenna to antenna wiring??

I have to make a conscious act to turn off my stop/start on our non-Audi every time I jump in it. Totally engineering averse system. Maximum wear on any engine and it’s ancillaries is at start up. If mine fails to work, it would be ‘thank you very much’. 
Just as well we are all different. 
Kind regards,

Gareth.