Hi, 

Bought a 2016 Superb estate two weeks ago and the tyre pressure monitoring system has come on 3 times since, checked pressures and down 1 or 2 psi, but the park assist disables when this happens. Is this normal? 

Hi, no not in my experience, the tyre pressure monitoring is linked to the abs system. I would have it checked out at a reputable garage.

 

1 minute ago, Peterarthur said:

Hi, no not in my experience, the tyre pressure monitoring is linked to the abs system. I would have it checked out at a reputable garage.

 

Thanks. Will ring a mechanic tomorrow.

It would be good if you are checking the tyre pressures cold and setting the TPMS if there was no pressure loss.

Is it one tyre that has a 1 or 2 psi drop?

Is it the valve, bead or really nothing causing that.  There should not be a pressure drop really if you are checking tyres cold at about the same ambient temp.

The TPMS only complains if the difference is 4 psi or more.

 

Anything less than that it wouldn't care.

 

I don't know about it affecting Park Assist, as I don't use Park Assist often, but it definitely affects ACC by disabling it if the TPMS warning is active.

Edited 14 March, 20215 yr by JR RS

Sometimes the TPMS seems to get upset for no apparent reason and repeatedly give a warning when all the pressures are ok; this warning doesn't point to a particular wheel . We've had four recent-ish SEATs and Skodas and they've all done it occassionally, often soon after fitting new tyres. The system does work though, we've also had genuine warnings that correctly identified tyres with low pressure.

 

Keep resetting and it gets the message eventually.

@JR RS   That 4 psi might be true of your TPMS and your cars,

but it is not true with all Skoda Models and different tyres / brands / compounds / sidewalls be they XL (Reinforced or not.)

 

Easy enough to check for anyone that want to inflate their tyres, reset the TPMS and let it set / settle and later let out 3 psi from a tyre.

 

7 hours ago, e-Roottoot said:

@JR RS   That 4 psi might be true of your TPMS and your cars,

but it is not true with all Skoda Models and different tyres / brands / compounds / sidewalls be they XL (Reinforced or not.)

 

 

Lol, it's not a number I've plucked.

 

The way it (direct or indirect TPMS) works is not specific to my car, nor specific to the Superb models. 

Nor is it specific to Skoda models, it's across all VW and Seat models too.

 

Indirect TPMS (Tyre Pressure Loss Indicator) uses the ABS sensors to compare the rotational speed of each tyre, and uses an algorithm to figure out differences in relation to  tyre pressures.

 

Direct TPMS (Tyre Pressure Monitoring System) has a sensor in each tyre, giving an actual reading.

 

Edited 15 March, 20215 yr by JR RS

@JR RS  Sorry but where did the number '4psi or more' come from if not 'plucked'?

(that has me thinking about the pheasant pluckers daughter.)

 

Sometimes the figure given by 'Publications' is that it is a drop of 25% that manufacturers have a warning given with their vehicles, 

that is a nonsense though.

 

I have seen a low profile tyre like 205/40 R 17 give a warning when set at 33psi and lose 3 psi.

Or even lose no pressure but give a warning hitting a bump in the road.

 

I think most people here drive cars or vehicles and know what the TPMS's are.  Most will have vehicles and drive them or work on them.

The OP has said that there is a bit of pressure loss of 1 or 2 psi.

If they are setting the pressures accurately & measuring a loss of pressure accurately then best see why any pressure is lost in a short time.

 

A 1psi drop for a 10*oC drop in ground / ambient temp is about right.

Tyre 'Experts' say a 1.5 PSI drop a month can be normal with car tyres.   Well maybe that is for some, or was.

It is not the kind of loss i have seen with tyres in the past 5 decades.

 

Some might have experienced a warning where the pressures checked cold were OK & as they had been set but there was a TPMS warning.

A binding brake or bearing on its way out can cause a wheel to heat and the tyre to overheat and the pressure to increase.

Take a car to the track and see how one front tyre might start to heat and and if there is a TPMS set there can be a warning.

Edited 16 March, 20215 yr by e-Roottoot

This is the third car I have had with TPMS, all Skodas (ABS sensors).  The wife has had 2 with it - Vauxhalls (Sensor on the valve).  All of them have gone off with a loss of 1-2 psi.

 

I don't see a regular loss from all tyres either, they will hold pressure for months or one will need a little air regularly.

 

few times a year i have false TPMS warnings reported by car,

but now no need to guess where is problem, after have installed Direct TPMS

 

and there is info how does pressure is changing according conditions change

  

On 02/09/2017 at 16:36, MartiniB said:

i used to 2.5 bar in front and 2.4 in rear,
but after have installed Direct TMPS

https://www.briskoda.net/forums/topic/434028-tire-pressure-monitoring-system/

decided increase to 2.7/2.5 because on colder(12°c) mornings that are equal to 2.3/2.2
but after few hours on hot highway(air >30°c; track >40°c; speed >130kmh) pressure increased to 2.9/.2.7

 

interesting, engine is boiling front right tire when in static,
have got 3.2 and  60°c after three hours waiting on Serbian Hungarian border(1km/3h; air 33°c; Sun from the left side)

while other three wheels were 2.8/2.6 and 42°c.

this dangerous situation can't be warned by built in Indirect TMPS