Tyre pressure monitor

[Izzug]

Just info for the forum,

I had to fit a new rear tyre a few weeks ago, the remaining 3 tyres had done about 20k, but still OK, the new tyre obviously has more tread and therefore a slightly bigger diameter. 

I'm assuming ( I don't actually know) that the tyre pressure monitor,  just counts the wheel/tyre revolution per unit length (when the steering wheel is centered) and if the readings per axle are different, it 'assumes' this is due to tyre pressure and gives the warning.  It is therefore assuming the tyre wear to be similar. 

I've obviously checked the pressures, all is well, but I've had to do a reset 4 times so far, I was hoping it was semi intelligent and would 'accommodate ' the difference between new and older tyres, but it does not seem that Citroen employed very good software programming. 

If it carries on any longer, I'll fit another new tyre to the same axle,  and that should sort it...

[evdama]

Indirect tpms uses wheel speed
Direct Tpms, bizarrly ,uses actual tyre pressure of all things..

Faulty system can invite an mot fail.

[Multispacer]

Just info for the forum,

I had to fit a new rear tyre a few weeks ago, the remaining 3 tyres had done about 20k, but still OK, the new tyre obviously has more tread and therefore a slightly bigger diameter. 

I'm assuming ( I don't actually know) that the tyre pressure monitor,  just counts the wheel/tyre revolution per unit length (when the steering wheel is centred) and if the readings per axle are different, it 'assumes' this is due to tyre pressure and gives the warning.  It is therefore assuming the tyre wear to be similar. 

I've obviously checked the pressures, all is well, but I've had to do a reset 4 times so far, I was hoping it was semi intelligent and would 'accommodate ' the difference between new and older tyres, but it does not seem that Citroen employed very good software programming. 

If it carries on any longer, I'll fit another new tyre to the same axle,  and that should sort it...

If your vehicle has a spare that is new, then maybe switch the slightly worn tyre on the same axle as the new tyre with the spare? Worth a try rather than going and buying another new tyre just so you don't get pressure warnings?

[Izzug]

Just info for the forum,

I had to fit a new rear tyre a few weeks ago, the remaining 3 tyres had done about 20k, but still OK, the new tyre obviously has more tread and therefore a slightly bigger diameter. 

I'm assuming ( I don't actually know) that the tyre pressure monitor,  just counts the wheel/tyre revolution per unit length (when the steering wheel is centred) and if the readings per axle are different, it 'assumes' this is due to tyre pressure and gives the warning.  It is therefore assuming the tyre wear to be similar. 

I've obviously checked the pressures, all is well, but I've had to do a reset 4 times so far, I was hoping it was semi intelligent and would 'accommodate ' the difference between new and older tyres, but it does not seem that Citroen employed very good software programming. 

If it carries on any longer, I'll fit another new tyre to the same axle,  and that should sort it...

If your vehicle has a spare that is new, then maybe switch the slightly worn tyre on the same axle as the new tyre with the spare? Worth a try rather than going and buying another new tyre just so you don't get pressure warnings?

Thanks,  I did just that this week.  The spare was new, so hopefully no annoying pressure warning.  I did notice when I removed the LH rear tyre is showed uneven wear, I know the previous model sumtimes had a faulty rear axle alignment,  but thought the K9 was fixed? Anyone else had a problem?