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Old 06.04.2021, 13:35
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Urgent MFK question - tyres

I've just driven up to our French house, having been absent since early December thanks to Covid, to swap my car onto summer tyres. It's due for it's MFK on Thursday morning, and the pressure sensors in the Winter ones aren't working properly so they're creating a dashboard message.

Unfortunately now I've got the summer tyres out I can see that they really should be replaced, but I've only got today and tomorrow to do it, which might mean it's not possible or that I end up having to go with whatever a garage might have in stock.

So the main question is: will these tyres fail the MFK?

https://drive.google.com/drive/folde...tO?usp=sharing

They're the worst two of the set, and you can see that there's quite marked shoulder wear on both of them. such that the htread pattern is no longer visible for a few mm. Am I right in thinking that that makes them illegal, and therefore an automatic MFK failure?

Alternatively, will a tyre pressure warning message fail, even if I can show that all the (winter) tyres are properly inflated?
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Old 06.04.2021, 13:53
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Re: Urgent MFK question - tyres

I can't be sure, but I think it is something to do with tread wear across 75% of the tyre. However it's quite possible that the tyre in the first image is beyond use due to excessive asymmetric wear.

From TCS Schweiz https://www.tcs.ch/de/testberichte-r...fahren-werden-
(DeepL)
The legal minimum tread depth is 1.6 mm. However, the safety-relevant driving characteristics decrease significantly even earlier. Therefore, summer tyres should be replaced when the tread depth of the tread - not at the tyre shoulders - is 3 mm. Excessively unevenly worn tyres can, however, be objected to regardless of this.
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Old 06.04.2021, 14:10
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Re: Urgent MFK question - tyres

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I can't be sure, but I think it is something to do with tread wear across 75% of the tyre. However it's quite possible that the tyre in the first image is beyond use due to excessive asymmetric wear.

From TCS Schweiz https://www.tcs.ch/de/testberichte-r...fahren-werden-
(DeepL)
The legal minimum tread depth is 1.6 mm. However, the safety-relevant driving characteristics decrease significantly even earlier. Therefore, summer tyres should be replaced when the tread depth of the tread - not at the tyre shoulders - is 3 mm. Excessively unevenly worn tyres can, however, be objected to regardless of this.
3mm is the number I know. Surprised 1.6 is still legal.

I usually check my tires when they're taken off for the season and chuck them away then. No nasty surprises the next season.
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Old 06.04.2021, 14:17
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Re: Urgent MFK question - tyres

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I've just driven up to our French house, having been absent since early December thanks to Covid, to swap my car onto summer tyres. It's due for it's MFK on Thursday morning, and the pressure sensors in the Winter ones aren't working properly so they're creating a dashboard message.

Unfortunately now I've got the summer tyres out I can see that they really should be replaced, but I've only got today and tomorrow to do it, which might mean it's not possible or that I end up having to go with whatever a garage might have in stock.

So the main question is: will these tyres fail the MFK?

https://drive.google.com/drive/folde...tO?usp=sharing

They're the worst two of the set, and you can see that there's quite marked shoulder wear on both of them. such that the htread pattern is no longer visible for a few mm. Am I right in thinking that that makes them illegal, and therefore an automatic MFK failure?

Alternatively, will a tyre pressure warning message fail, even if I can show that all the (winter) tyres are properly inflated?
Do the MFK with winter tyres, then you have time to get the tyres you want at the price you want to pay.
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Old 06.04.2021, 14:22
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Re: Urgent MFK question - tyres

Panic over - now the garages have reopened after lunch I've managed to source a full set of four to be fitted tomorrow. Nokian, apparently, which I've had before, but no idea which particular model. Not too expensive either.

That TCS link does seem to confirm my feeling that the old ones would fail, though. Couldn't find it in French, for some reason, so I haven't read it all through completely...
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Old 06.04.2021, 14:24
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Re: Urgent MFK question - tyres

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Alternatively, will a tyre pressure warning message fail, even if I can show that all the (winter) tyres are properly inflated?
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Do the MFK with winter tyres, then you have time to get the tyres you want at the price you want to pay.
Perhaps you missed the above question? I was very much concerned that they would fail for the false error, which is why I put the test off as long as I could and have driven up here especially to refit the summer ones.
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Old 06.04.2021, 14:30
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Re: Urgent MFK question - tyres

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Perhaps you missed the above question? I was very much concerned that they would fail for the false error, which is why I put the test off as long as I could and have driven up here especially to refit the summer ones.
Generally by playing with settings on the computer you can get the warning to go off.

I think the tyre without much edge is a fail which is why I suggested what I did.
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Old 06.04.2021, 14:32
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Re: Urgent MFK question - tyres

I don't think they can fail you for that warning, I mean it's an extra system that most people I know don't have fitted to the winter wheels. If they check the pressures there shouldn't be an issue.
No personal experiences though.
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Old 06.04.2021, 14:40
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Re: Urgent MFK question - tyres

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Generally by playing with settings on the computer you can get the warning to go off.
Can't be done through the normal car controls, and despite meaning to get a round tuit for many years I've not got a VAG-Com interface cable thingy.
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Old 06.04.2021, 14:48
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Re: Urgent MFK question - tyres

I've a Seat, I know with mine it gives me a low pressure warning sometimes. But I don't have the wheel mounted sensors, I think it bases it off the suspension/brakes or something.
You then need to dive through a few screens until you select an option saying that you've checked the pressures and they're fine.

I know a colleague has a Levorg with the tyre valve mounted system, he just ignores the warnings for winter.
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Old 06.04.2021, 14:51
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Re: Urgent MFK question - tyres

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Can't be done through the normal car controls, and despite meaning to get a round tuit for many years I've not got a VAG-Com interface cable thingy.
Thats a shame, had some VW hire cars that kept doing this & I was able to reduce the expected pressure on the dashboard & that fixed the warning
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Old 06.04.2021, 14:55
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Re: Urgent MFK question - tyres

The summer tires are very bad and will fail you for certain! I would also check ASAP the geometry of your car as any new tires will be quickly worn out the same way the pictures show.
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Old 06.04.2021, 16:03
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Re: Urgent MFK question - tyres

yes, lack of TPMS for cars after some date is failure.
yes, those tyres would fail. (how did they even get to that condition, let alone get removed and put away to refit?).
looks like the car will fail anyway on worn suspension parts.
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Old 06.04.2021, 16:36
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Re: Urgent MFK question - tyres

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I've a Seat, I know with mine it gives me a low pressure warning sometimes. But I don't have the wheel mounted sensors, I think it bases it off the suspension/brakes or something.
You then need to dive through a few screens until you select an option saying that you've checked the pressures and they're fine.

I know a colleague has a Levorg with the tyre valve mounted system, he just ignores the warnings for winter.
Most likely your car has indirect TPMS, which measures angular velocity via the ABS and via voodoo AI software magic somehow calculates the pressure. After putting air in the tire it is recommended to reset the system via the customer friendly menu. TPMS has been mandatory for all new cars sold in the EU since 2014.
https://en.wikipedia.org/wiki/Tire-p...itoring_system
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Old 06.04.2021, 18:21
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Re: Urgent MFK question - tyres

The TPMS on VAG cars can generally be quickly "coded-out" with a diagnostic interface by removing a tick-box. The car will think it's not got a TPMS installed, therefore no light will come up.

Chinese VCDS knock-offs can be bought on Ricardo for peanuts, and they come in very handy.
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Old 06.04.2021, 18:30
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Re: Urgent MFK question - tyres

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The TPMS on VAG cars can generally be quickly "coded-out" with a diagnostic interface by removing a tick-box. The car will think it's not got a TPMS installed, therefore no light will come up.

Chinese VCDS knock-offs can be bought on Ricardo for peanuts, and they come in very handy.
The VAG one I bought on Amazon even allows for 'milage correction' amongst other things.
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Old 06.04.2021, 19:58
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Re: Urgent MFK question - tyres

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The summer tires are very bad and will fail you for certain! I would also check ASAP the geometry of your car as any new tires will be quickly worn out the same way the pictures show.
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yes, those tyres would fail. (how did they even get to that condition, let alone get removed and put away to refit?).
looks like the car will fail anyway on worn suspension parts.
Nah, I think it's fine. Had it checked out a couple of months back searching for a knocking noise, turned out to be a loose bit of underbody insulation, now fixed.

The wear pattern is just a result of enthusiastic cornering and generally controlled gentle braking, the summer fronts have always gone that way since it was new. It's an R36, which I enjoy pushing on the twisty mountain roads. Those had probably done 40000km.

Anyway, as I said I've got some new ones lined up for tomorrow, so problem resolved.
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Old 06.04.2021, 20:55
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Re: Urgent MFK question - tyres

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It's an R36, which I enjoy pushing on the twisty mountain roads. Those had probably done 40000km.
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passat or GTR? 40k km on one set of tyres. i'm flabbergasted. that's at least 4 times what i've ever managed.
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Old 06.04.2021, 21:11
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passat or GTR? 40k km on one set of tyres. i'm flabbergasted. that's at least 4 times what i've ever managed.
Passat. 4WD and traction (and launch) control means that it's almost impossible to get wheel spin, unless you're really _really_ trying to, and specifically turn off the TCS. I only do that to allow a little occasional drift on on mountain twisties, hence the shoulder wear.

They've been swapped to (or from, I misremember) the rear to even out the wear, and I'm a very forward-planning driver so rarely brake hard. Plus a lot of that was motorway driving.
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