Hawklord3 wrote: ↑Mon Oct 23, 2023 8:19 pm
it is still flashing that front tyre saying low pressure, fault??.
Hi 'Hawklord3’.
Firstly, as it is unusual to hear of tyre pressures in the UK described in bars, are you UK based?
Most UK drivers refer to the PSI scale for their tyres so, as has been queried, did you mean to state the pressure differential in bars as each bar is almost 15 PSI?
It might be worth mentioning that while those TPMS which provide a readout for each individual wheel are fairly accurate, they are nonetheless not necessarily perfect in absolute terms. Moreover, the advice in regard to measuring tyre pressures should be adhered to each time the pressures are checked. Apart from the small differences which may occur between wheels in the rate at which the sensors operate and change the readout, the environment in which they operate is subject to climate.
By way of example, if I check my tyres in mid-morning, the sun may have been shining down on one side of the car while the other side remains in cool shade till afternoon. That causes an initial imbalance in the readout on-screen between each side of the car. Once underway and perhaps having sun on the other side mostly, the pressures will soon equalise.
On my car, I would not expect any warning of a soft tyre until the reading was about 4 or 5 PSI less than other wheels. Differences of one or two PSI are pretty irrelevant but might suggest that one should keep an eye on the matter as it may indicate the beginning of a slow puncture.
A standalone pressure gauge is a useful tool for checking pressures as those tyre inflators with built-in read-outs may or may not be reliable. I can attest to differences between various inflators I have used, some of which are in the depths of no longer used bits and pieces in one corner or another of my shed.
Some owners seem to imagine that by diverging from the manufacturer’s recommended pressures, the ride quality or cornering stability may be improved but those recommendations are based on much testing by professional experts who know a lot more about the ride and handling of passenger cars than the average car owner. Those recommendations are not achieved by the vehicle manufacturer in isolation. The carmakers work with tyre producers to ensure that the selected tyre for a particular vehicle meets all safety requirements relative to the country or region in which the vehicle is intended to operate.
Hyundai, like some other carmakers, recommend standard pressures all round but additionally advise a higher pressure on the rear tyres when the car is fully laden, particularly if most of the additional load is in the luggage area at the back. When I drove my car home from the dealership on first collecting it, I was appalled by the ride quality - it was atrocious! I was almost inclined to turn around and reject the car; it really was that bad. As it bore no resemblance to the car that I had been given for a lengthy test-drive only four weeks before, as soon as I got home, I dug out my favourite pressure gauge just to see how the tyre pressures were. I was disgusted to discover that all of the tyres were mid-40s PSI and hours later, once the ambient temperature had dropped quite a bit, the actual pressures were 42/43 PSI.
My disgust was in the knowledge that the pre-delivery inspection, whether at Tilbury before delivery to the dealership or at the actual dealer’s premises, had failed to identify and correct the pre-transit pressures of the tyres. Once corrected and after a couple of hundred miles of use, the ride was not only better, it was like night and day! So much for PDI!
‘Hawklord3’, it would be useful if you could return with some farther information as many readers of these pages will be curious to know whether you indeed have a slow puncture or perhaps a faulty sensor.
2023 Tucson Hybrid (HEV) Ultimate; ordered 12/05/23 - collected from dealership 07/06/23.
- that would be a fairly major change, normally associated with a nail or screw in tyre. Have you done a physical inspection of the tyre 
