Tyre Pressure

[UberLovey93]

Hi All,

New poster here.

I currently drive a Seat Leon 21 plate. Earlier in the week, my missus drove over something which caused a roadside puncture. We got it to a nearby garage who replaced the tyre. Since then, then - the tyre pressure has dropped every single day (not by much so its not driveable) but I've had the Alert come up on the dash and had to put air it the tyre.

Now, I know square to nothing about cars - but if we've replaced the tyre - does anyone have any suggestions to what is causing the loss of Air?

Thanks,

 

[Syphon]

Welcome, that doesn't sound ideal. I'd be taking it back to the garage as it sounds like a slow puncture which I'd be insiting was their issue to resolve and probably not right upon installation.

 

[serdar_18fr]

Hi All,

New poster here.

I currently drive a Seat Leon 21 plate. Earlier in the week, my missus drove over something which caused a roadside puncture. We got it to a nearby garage who replaced the tyre. Since then, then - the tyre pressure has dropped every single day (not by much so its not driveable) but I've had the Alert come up on the dash and had to put air it the tyre.

Now, I know square to nothing about cars - but if we've replaced the tyre - does anyone have any suggestions to what is causing the loss of Air?

Thanks,

The answer is probably yes but I'll ask anyway:
Do you reset the tyre pressure monitoring system every time after inflating the tyre again ?

 

[UberLovey93]

The answer is probably yes but I'll ask anyway:
Do you reset the tyre pressure monitoring system every time after inflating the tyre again ?

No worries - Yes, I do reset the monitoring system...

My worry is that isn't a tyre issue, its a Wheel/Rim issue? I just wondered if anyone else had a similar issue before I go back to the garage...

Thanks

 

[tracktoy]

I would go back to them but i have in the past had a slow drain issue and took it to a tyre place, They resealed the tyre and problem went away.

But of course it could be a damaged wheel but I would expect the shop to tell you that when they are doing the balancing.

 

[Tell]

No worries - Yes, I do reset the monitoring system...

My worry is that isn't a tyre issue, its a Wheel/Rim issue? I just wondered if anyone else had a similar issue before I go back to the garage...

Thanks

Yes if you dont reset it is likely to go off again. Also experienced a bit of sun on one side once which messed things up. That settled down. I was off to Ireland kept badgering me. Check, reset etc. Weird one.

Those garage / petrol pump gauges are suppose to be pretty inaccurate. Don't use them but cross check with a Halford gauge, branded, that memories front and back tyre pressures. Pump to above and let down to desired. That device beaps when you hit the range. So if you dont get them in the tolerance limit and reset etc etc. There will be more experts than me on how it sounds the alarm. A sticker in the door tells you the pressures normal. You dont pump to the soggy comfort figure.

 

[yonny]

my missus drove over something which caused a roadside puncture. We got it to a nearby garage who replaced the tyre. Since then, then - the tyre pressure has dropped every single day (not by much so its not driveable) but I've had the Alert come up on the dash

This happened on my 2018 FR ST. Massive pot hole, puncture, replaced the tyre. The pressure alert came up within a couple of days so I put more air in and reset the sensor. Came up again after a couple of days so I checked the air and it was fine..... reset the alarm. It stayed off for ages so assumed it was just a dodgy sensor. When I next topped up all the tyres - reset the alarm and it turns on again after a couple days. Checked air.... fine. Rest alarm and it was ok for ages.
I guess what I'm saying is check the air as the sensor can get knocked on a pot hole and do funny things! I didn't bother replacing the sensor once I had figured out its nuances.

 

[RUM4MO]

@yonny are you sure that your car's wheels do have tyre pressure sensors fitted in/on them, typically VW Group cars just use the ABS wheel road speed sensor info to work out if there is a tyre losing air.

Some sales territories do require wheels to be fitted with tyre pressure sensors and they are known as "direct" tyre pressure sensors.

 

[Tell]

Yes there are two systems atleast and Seat gets the budget one. Some on here have fitted the advanced one (direct). The cheapo sensing needs the pressure to be matched on both sides accurately and the reset pressed.... least how I remember it.

It's all in the wiki

Tire-pressure monitoring system - Wikipedia

en.wikipedia.org

Indirect is what Seat uses.

 

[serdar_18fr]

Indirect is what Seat uses.

One might have the direct system in their secondhand-bought car if a previous owner had retrofitted it.

 

[Tell]

You should see that on the display with the individual pressures shown. If not, indirect. I can see why people like the direct method, no fumbling with a tyre gauge.

 

[SRGTD]

You should see that on the display with the individual pressures shown. If not, indirect. I can see why people like the direct method, no fumbling with a tyre gauge.

I’m ‘old school’ and I check my tyre pressures when I do my other regular checks (under bonnet fluids) and it only takes a few minutes to do. The TPMS isn’t infallible and I’ve had false warnings - usually when we have a sudden cold weather spell.

 

[Tell]

The fumbling is squatting down sticking the gauge on. The next bigger fumble is screwing in the pump. One of these Ring ones where you screw it in, the air escapes whilst you battle to get it on secure with no air leaks. Pump up over to allow a margin for escaping air. Then test with a proper gauge.

Yes I dont think you should use the warning in place of a physical check. It's not going to tell you if they have them all slowly deflating. Just when you have a puncture of one form or another sufficient to alarm you. The odd screw stuck in the tyre. Jet washing block paving throwing up those careless screws builders left on the drive or that tip run when they hadn't swept up the area. My punctures down to those of recent.

 

[yonny]

@yonny are you sure that your car's wheels do have tyre pressure sensors fitted in/on them

Tbf I have no idea mate.... I just know there was a problem with mine!

 

[Tell]

Well its going to be the standard monitoring I'm sure not the direct method where each wheel is checked and as syphon says above get it checked, there must a small leak. Failing that they didnt set up the TPMS correctly by pressing the reset or the pressures are wildly out so TPMS (the standard indirect method) is flagging that up.

With your own good pressure gauge you can check yourself irrespective of what TPMS says and an electric pump to get air into it. You need that for situations like this. Garage pumps are known to be inaccurate. TPMS goes off, you check the pressures with an external digital tyre pressure gauge and pump up if required. Monitor and if one is still going down take it to a garage. If TPMS sensing is at fault get that sorted.

 

[RUM4MO]

These "screw on" tyre pressure gauge and tyre compressor tend to be okay if you start screwing down the retaining sleeve then, before the tyre valve starts to open, press the hose fitting down as far as possible onto the tyre valve, then fully tighten the retaining sleeve - use the same technique when removing, ie slacken the sleeve as much as you can while holding the fitting down onto the valve, then pull it up as far as possible then finish unscrewing the retaining sleeve, in both cases you should only end up with a "short sharp" hiss of air loss.
I've converted my electric (battery) tyre compressor over to the "push on" type that have a clip that grips the valve cap thread, done the same for my "good" digital tyre pressure gauge - and these work well.

The Laser Tools brass "screw on" fitting I've bought, have been fitted to my brake bleeding kit as I've fitted a tyre valve into the end of the "pressure source container (garden sprayer)" and connecting to that using the standard compression/over centre fitting gets annoying.

 

[Tell]

These "screw on" tyre pressure gauge and tyre compressor tend to be okay if you start screwing down the retaining sleeve then, before the tyre valve starts to open, press the hose fitting down as far as possible onto the tyre valve, then fully tighten the retaining sleeve - use the same technique when removing, ie slacken the sleeve as much as you can while holding the fitting down onto the valve, then pull it up as far as possible then finish unscrewing the retaining sleeve, in both cases you should only end up with a "short sharp" hiss of air loss.
I've converted my electric (battery) tyre compressor over to the "push on" type that have a clip that grips the valve cap thread, done the same for my "good" digital tyre pressure gauge - and these work well.

The Laser Tools brass "screw on" fitting I've bought, have been fitted to my brake bleeding kit as I've fitted a tyre valve into the end of the "pressure source container (garden sprayer)" and connecting to that using the standard compression/over centre fitting gets annoying.

Was my easy fit electric pump that broke. Now the screw type. Ok but you pump up over and let down to the figure with the tyre pressure gauge releasing air.

 

[RUM4MO]

Was my easy fit electric pump that broke. Now the screw type. Ok but you pump up over and let down to the figure with the tyre pressure gauge releasing air.

Yes, I never trust the gauge on my 12V DC tyre compressor - but it is probably accurate "enough", like you always aim to over inflate and use the "release" button on the digital gauge to trim the pressure to what I want/need.

The "rubber" on the air hose cracked in my 12V DC tyre compressor, finding a new flexible hose with suitable threaded end fitting was tricky - 2 sizes normally used universally but finding spare hoses with the correct one, that were also slightly longer was not so easy, but eventually a "made in China" correct one appeared and was bought and fitted and "leak proofed" with steel loaded Araldite, so that should sort things out for the remaining life of that tyre compressor!