Persistant Loss of Tyre Pressure Alarm

[irobot2308]

Hi. I keep getting a Loss of Tyre Pressure notification for the rear left tyre on my 2017 Leon FR SC. I have checked the tyres and they seem to be fine, and I have also recently had a new battery as part of the car's recent service. I clear the notification, but after about a week or two, the notification re-appears.

What would be the reasons for this happening?

 

[serdar_18fr]

What would be the reasons for this happening?

A bent wheel, maybe?

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[SRGTD]

@irobot2308 - as @serdar_18fr has suggested, or possibly a cracked alloy.

I see you’re from the Netherland. If the condition of roads in the Netherlands are as poor as they are in parts of the UK, then unfortunately it’s all too easy to damage a wheel or tyre (and damage to the inner face of a tyre can often get missed when checking tyres) if you’re unfortunate enough to hit a pothole or a raised or dropped drain cover.

 

[Walone]

Hi. I keep getting a Loss of Tyre Pressure notification for the rear left tyre on my 2017 Leon FR SC. I have checked the tyres and they seem to be fine, and I have also recently had a new battery as part of the car's recent service. I clear the notification, but after about a week or two, the notification re-appears.

What would be the reasons for this happening?

I assume that you have actually checked the pressures and that they have been ok? If the pressures have been ok, then I would suspect a faulty ABS sensor.

 

[serdar_18fr]

What would be the reasons for this happening?

Also, maybe not so common but tire valve stems may wear out and fail over time.

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[SRGTD]

@irobot2308 - Just a thought; after you’ve checked the tyres are the correct pressure and adjusted them as necessary, have you stored those correct the tyre pressure values via the car’s infotainment screen in the vehicle‘s settings menu?

 

[RADIOTWO]

I assume that you have actually checked the pressures and that they have been ok? If the pressures have been ok, then I would suspect a faulty ABS sensor.

They don't use sensors, it works off the ABS

 

[serdar_18fr]

They don't use sensors, it works off the ABS

ABS has also sensors on each wheel (not in tire), to measure the number of rotations & speed. (Hence the tire pressure change calculation) @Walone was talking about those ones.

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[RADIOTWO]

ABS has also sensors on each wheel (not in tire), to measure the number of rotations & speed. (Hence the tire pressure change calculation) @Walone was talking about those ones.

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Yes but if it was a ABS that was at fault you would have a ABS fault, I think your loss of air is poss the rim or the valve stem

 

[cairus]

I think strictly speaking, the system calculates the tire circumference using the square signal that was determined by the ABS sensor. If there is a loss of compressed air, the circumference changes, thereby changing the square signal and the warning message appears after the defined hysteresis.

 

[serdar_18fr]

Yes but if it was a ABS that was at fault you would have a ABS fault, I think your loss of air is poss the rim or the valve stem

That's not always true.
You might be getting incorrect values from a faulty sensor which might not have thrown a fault itself yet.

 

[nd-photo.nl]

You might test this by disabling ABS (temporarily) all together?

 

[cairus]

The tire pressure control is much more "sensitive" than the ABS. The ABS monitors for plausibility and electrical shortcuts. This means that if the sensor does not constantly output high or low or has an edge change within a defined time and no electrical shortcut, the tire pressure control will usually always report first.

 

[Walone]

So far @irobot2308 has not confirmed that he is actually losing pressure!

 

[Pinky]

Swap 2 wheels over. See if the fault continues on the lr or follows the wheel.

 

[cairus]

I personally suspect a defective ABS ring in the wheel bearing or sensor