Well had TPM fitted, got the Car home and set the pressures with a digital Tyre Pressure Monitor and seperate pump, then set the in Car TPM system.

Anyway 4.5K miles later the warning light came on today, no obvious flat so tested pressures. They were set at 32 Front 34 Rear, they read today 30.5 & 31.5 front so not bad, but rear read 31 offside and 27 nearside :eek: personally I would of thought TPM would of come on before such a big drop.

Well had TPM fitted' date=' got the Car home and set the pressures with a digital Tyre Pressure Monitor and seperate pump, then set the in Car TPM system.

Anyway 4.5K miles later the warning light came on today, no obvious flat so tested pressures. They were set at 32 Front 34 Rear, they read today 30.5 & 31.5 front so not bad, but rear read 31 offside and 27 nearside :eek: personally I would of thought TPM would of come on before such a big drop.[/quote']

My understanding is TPM compares wheel revolutions (using the ABS sensors) so as two tyres on the same axle slowly lose air as normal nothing is flagged up by TPM. It only flags when a the difference in rpm between two wheels on the same axle caused by tyre pressure differential passes a preset threshold, whatever that might be.

TPM is not an alternative to checking tyre pressures regularly it is to flag up abnormal deflation. it couldn't do the whole job as it cannot check the spare.

My understanding is TPM compares wheel revolutions (using the ABS sensors) so as two tyres on the same axle slowly lose air as normal nothing is flagged up by TPM. It only flags when a the difference in rpm between two wheels on the same axle caused by tyre pressure differential passes a preset threshold' date=' whatever that might be.

TPM is not an alternative to checking tyre pressures regularly it is to flag up abnormal deflation. it couldn't do the whole job as it cannot check the spare. [/quote']

The tyre pressure monitor kit that I have seen has a pressure sensor/radio module at the base of the valve, inside the tyre and it communicates the pressure info by radio to a receiver that then displays the pressure.

These modules are quite easily damaged by hairy *rsed tyre fitters!!

However, it may be that the cheaper systems use the method described by gamichea - whatever, it must always be safest to also manually check the pressures!

John.

The Skoda one is the cheaper system.

I think it all comes down to the lack of info available when I ordered my Car back in September. The dealer thought the TPM displayed the Tyre Pressures on the Audi Unit Display, but obviously not.

Was hoping it was like the system on the Laguna.

Was hoping it was like the system on the Laguna.

I was hoping it wasn't, that's why i didn't order it. The number of times that my old laguna was insistant that a number of wheels were missing whilst driving along got really rather tiring. I still have the warning light burnt into my retina, damn french crap.

Agree with JayTee and agent006. Don't know about the Audi system except it costs

I'm sure Octy one is ABS based. I reckon that the difference in pressures would need to be pretty big before it picked up a significant difference in wheel rotation speed and, if you lost pressure in both wheels on an axle, it would never notice. Based on that I didn't specify it. Of course I'll feel pretty silly if I'm wrong and I've missed out on a really clever piece of kit.....

Agree with JayTee and agent006. Don't know about the Audi system except it costs

I have the TPM on my Occy II. It uses the ABS system to monitor the wheel revs. On normal tyres when driving straight, they will both have roughly the same rpms. On a deflated tyre one will be "Taller" therefore take longer to do 1 revolution. If you compare 2 tyres and one has a different number of rpms in a given time, then it lets you know. I reckon this system is best as unlike the Renault one, there are no transmiters to woory about at tyre change or batteries in transmitters to change etc.

It has only pinged on me 3 times:-

2 were punctures (Which I may not have spotted) and the 3rd when I had new tyres and I forgot to press the reset button. Would I have it on my next car, YES, 100% defo!

Being really picky now, but here goes (Call it continuous improvement Skoda:), it would be nice if it at least told me which axle (eg front / rear tyre on the maxidot, instead of just a light and a ping), so I didn't have to go hunting with my tyre pressure gauge (last time it was the 4th wheel I checked - sods law!). But that's my only very small gripe with it. Otherwise been faultless in 4 years!

For a

Had the system first on my mini cooper s which was awesome. remember coming home from work 1 night and the light coming on. checked the tyres, and they were ok so reset it. came on 10 mile later where i checked the pressures which were ok,then 5 mile from home poss another 5-10 mile later, the light was on again with a flat. What amug!! Only downside on the mini was 17" runflats. a soddign fortune for a new tyre!!!!!!!!

I think it's a useful feature. I've had two warnings in three years and both were punctures that hadn't yet affected the handling of the car. I've never had a false warning from the system.

I agree that it would be useful if it told you which tyres to check - similarly, it would be good if the 'door open' warning indicated which one.

similarly, it would be good if the 'door open' warning indicated which one.

It does if you have maxidot