Tyre deflation warning constantly coming on.

[Kremmen]

Spot on

As the new tyre wall beds in and softens it does trigger the TPMS a few times

Should take about 300 miles

[Lord Voltermore]

Spot on

As the new tyre wall beds in and softens it does trigger the TPMS a few times

Should take about 300 miles

This is also the reason why odd makes of tyre can sometimes give false alarms. Some tyre walls are more flexible than others. And may heat up at different rates, affecting air pressure.  Even the same brand and model of tyre sometimes come in standard and  XL (extra load) versions ,or different speed ratings etc  that might affect side wall flexibility.

[Webley]

Check you haven't got a sticking brake caliper.
This can cause the TPMS to trigger as it works off the speed sensors.
Had this with our HRV when we first got it.
Changed the pads and flushed the brake fluid ,problem solved.

[TnTkr]

Could you please elaborate how the sticking brake caliper affects to the wheel speed sensors.

[edam]

I have had problems with TPMS when driving on one section of the M25.
This is where they had changed to a "smart motorway".
So when driving in lane 1 the nearside wheels were running on the old hard shoulder whilst the off side was on the normal surface.
This difference in road surface seemed to upset the TPMS

[Kremmen]

I used to drive the M25 daily and never had a problem

I still believe the initialisation is important

The advice was to perform a half hour drive taking in left and right corners, various speeds and road types.

My 20 mile journey to work was perfect as it took in A roads, B roads, 2 Motorways and various speeds and took 40 mins.

I've seen posts where some have performed the initialisation in a number of short journeys which in my view may cause issues

[ColinB]

Most of the reports of false alarms seem to involve motorways, which makes me wonder whether the calibration process is being carried out diligently. The handbook advises you should get up to high speed during the calibration period. If you don’t, and just pootle around at 30-40mph, then the system isn’t seeing the full range of wheel speeds so how would it know what’s normal at motorway speeds? Probably exacerbated by mismatched or new tyres, as reported by some.

[degzi]

Most of the reports of false alarms seem to involve motorways, which makes me wonder whether the calibration process is being carried out diligently. The handbook advises you should get up to high speed during the calibration period. If you don’t, and just pootle around at 30-40mph, then the system isn’t seeing the full range of wheel speeds so how would it know what’s normal at motorway speeds? Probably exacerbated by mismatched or new tyres, as reported by some.

Also tyres gain a few psi when they get hot on motorway speeds, so any small difference is exaggerated.
I'm guessing different brands have different rubber properties too which again accounts for different branded tyres heating up at different speeds and giving false alarms.