RS3 Stop/Start Not Working

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IanL-RS3

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I've had the car since Oct 2022. And the stop / start function hardly ever works. The last time i remember it working was after a flat battery in Jan. But it hadn't worked for a while before that. And stopped working soon after.

Anyone else.?

I have tried cycling the stop/start.

I'll run a diag on it sometime soon.

I just had an ASN what you have missed email and decided to post while i remember.
 
IanL-RS3 said:
I've had the car since Oct 2022. And the stop / start function hardly ever works. The last time i remember it working was after a flat battery in Jan. But it hadn't worked for a while before that. And stopped working soon after.

Anyone else.?

I have tried cycling the stop/start.

I'll run a diag on it sometime soon.

I just had an ASN what you have missed email and decided to post while i remember.
Click to expand...

Does it throw an error in the display, like "start/stop malfunction, contact workshop"?
Mine has been doing that randomly and the dealer diagnosed it as a faulty battery or faulty battery controle module (J367). They replaced both under warranty. I just got the car back today, so don't know if it actually fixed the problem. But in general, start/stop issues are frequently due to low battery or battery-related problems as the start/stop module checks the battery-status before it activates (which makes sense as start-stopping is taxing on the battery).

It also checks a number of other components before activating, so it is not certain that it is battery-related.
 
It doesn't show an error on the display. But i don't drive it very often and had a flat once. So maybe there is a battery related issue - i'll look in that. Thanks
 
It will be because the voltage has dropped below the minimum threshold for it to operate. This will always happen to a car not used very much. I would recommend a trickle charger to stop the battery inevitably deteriorating to a point where replacement is the only option.
 
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Also some things like having dual zone climate with different temperatures set, heated seats, and others can cause it to not function.

Or could just be battery related as others have said.


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Daggerit said:
Also some things like having dual zone climate with different temperatures set, heated seats, and others can cause it to not function.

Or could just be battery related as others have said.


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Oh right. ... That sounds like me! Okay will try and drive around like a peasant and see if it works.. Thanks
 
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IanL-RS3 said:
Oh right. ... That sounds like me! Okay will try and drive around like a peasant and see if it works.. Thanks
Click to expand...

Haha, it kind of defeats the point doesn’t it?


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So glad we don't have the start/stop function in the US. We have it in our Alfa but when the battery is low, as others have mentioned, that function is one of the first to be shut down. I suggest a battery tender. Have it for all of our vehicles.
 
A BMW with MHT (mild Hybrid technology) pulled away from a drive whilst I was walking the dog, such a smooth take off, it went around 10 feet before I heard the ICE cut in,
 
Weird driving back from my Audi Service Start / Stop was working fine!

Bad news is i need a new rear tyre (cord showing through tread) which means 2 rear tyres. And there's wear on my rear discs.
 
Better ensure that from the dealer. I had to replace one tyre for 8Y A3 and they told me there was bigger tolerance for tread between the wheels on the same axle as between the axles. The average between the wheels on different axles had to be less than a certain value. So if my tyres would have been more worn I should have replaced one on front and one on rear axle, instead of replacing both tyres on the same axle, which would easily sound more logical. Luckily I only had to replace the broken tyre.

Could be all different with 4wd but better to know before doing anything.
 
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JKP said:
Better ensure that from the dealer. I had to replace one tyre for 8Y A3 and they told me there was bigger tolerance for tread between the wheels on the same axle as between the axles. So if my tyres would have been more worn I should have replaced one on front and one on rear axle, instead of replacing both tyres on the same axle.

Could be all different with 4wd but better to know before doing anything.
Click to expand...

I've had 4wd cars for the past 20 years* and always changed the tyres on the same axle. The X5 i've got is even more finnicky in that if the rolling radius is far out the transfer box doesn't like it and the car crabs.


* crashed a RWD E30 325i (best car ever!) without LSD and on 14inch wheels when i was younger as i accelerated hard with one wheel hitting the centre white line and causing me to spin as i wasn't expecting it. So i'm a big fan of 4WD! Starting with an 8L!
 
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Ok, you can do as you've always done or make a short phone call to ensure what's right. Audi might be monitoring different targets than BMW even though both 4WD. Espeially the RS3 could be very unprdedictable with its torque vectoring. I've also heard the car is picky with perimeters, which should be concerned when choosing all-new tyres.
 
IanL-RS3 said:
4.6mm on both...just some slices through to the cord on one (they showed me video). And being 4wd i guess best to replace in pairs!
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I do the same, but I tend to keep the good tyre in the back of the shed as a spare. Saved me replacing 2 on occasion as a new tyre would have been out of spec but the half worn I had was fine! potholes tend to favour the near side.
JKP said:
bigger tolerance for tread between the wheels on the same axle as between the axles.
Click to expand...
Correct as it is just like going round a corner but it can make the car crab and increase wear. It can also fool the stability systems as they use wheel speed for a lot of things. Manufacturers do set these things for a reason.
IanL-RS3 said:
crashed a RWD E30 325i (best car ever!) without LSD
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With the old plate LSD it was a different problem, they went in a straight line no matter what, ask me how I know :grinning:
 
flybynite said:
I do the same, but I tend to keep the good tyre in the back of the shed as a spare. Saved me replacing 2 on occasion as a new tyre would have been out of spec but the half worn I had was fine! potholes tend to favour the near side.

Correct as it is just like going round a corner but it can make the car crab and increase wear. It can also fool the stability systems as they use wheel speed for a lot of things. Manufacturers do set these things for a reason.

With the old plate LSD it was a different problem, they went in a straight line no matter what, ask me how I know :grinning:
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Yeah i used to have a garage full of tyres (and still have some) from the fat datsun, x5 etc. but in this instance i forgot to ask for 'good' the tyre! But i've switched brands, so i'm not likely to use it. And i would have had to fished it out of their pile of tyres just to have to take it up to the lock up to keep it forever and never use it! Somewhere at some time i've changed! :)

I really wish i'd known what the lack of LSD meant when i had that car!! It was such an amazing car! I still miss it. More so than any other car i've owned!
 
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Man you should be delighted, S/S is only long run trouble. Failed turbos, accelerated starter wear and general wear from oil circulation. Its there only to bump their emissions numbers. Id be happy if mine stopped working
 
evo400 said:
Man you should be delighted, S/S is only long run trouble. Failed turbos, accelerated starter wear and general wear from oil circulation. Its there only to bump their emissions numbers. Id be happy if mine stopped working
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Okay - you've sold me on it!

I'm guessing it's something to do with the dashcam i have. But who knows!
 
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