As elekie says - I and my wife have run a few BMWs with the ABS-type system, and all have been 100% reliable. The newer TPMS-valved systems, on the other hand, are already getting a bit of a reputation for problems - and expense.

I can confirm the tyre pressures are spot on. This was also confirmed by the Honda main dealer.

What tests has the dealer done to assert that there is no problem apart from just checking the tyre pressures?

For a start, I'd check the tyres are all the same size (not that uncommon for a car to be fitted with the wrong profile tyre). Then if the pressures are all correct, get a diagnostic scanner connected up to the car to monitor the ABS wheel sensors and drive the car to make sure they are all reading the same road speed on a straight road. It could be a faulty sensor on one wheel.

The dealer said that they had connected it up to a laptop. It would be interesting to know if the system is capable of pointing to a particular wheel.

My diagnostic tool can show road speed for each individual wheel as can most half decent profession ones. I suspect that it is seeing a speed difference outside of the set parameters and assumes a tyre is deflated.

He vaguely said that he had seen something on the diagnostics, and thought he had cleared it.

Probably means there was a fault code stored and in true professional style he cleared the code and hoped the problem had gone away.

The main dealer had another look at this. They failed to find any cause for the problem, but did say that many other Jazz owners are having the same problem, and that Honda are trying to come up with a fix.

The main dealer had another look at this. They failed to find any cause for the problem, but did say that many other Jazz owners are having the same problem, and that Honda are trying to come up with a fix.

They could offer a software tweak that disabled the system completely but reported that everything was OK, so you'd pass an MOT.

I'd buy one, but then I have a tyre pressure guage anyway.

Oh wait... you said Honda, not VW...pity.

Yes but unlike Der Wurst German Car company - they will come up with a fix!

Some progress, I think! Apparently this fault is common with the current Jazz, and the Honda CRV.

Working with Honda, the main dealer tracked my problem to one of the tyres. The car came fitted as new with Michelin Energy tyres, but when just 6 weeks old, one tyre had to replaced due to a puncture. And they say a slight mismatch between the original and replacement tyre was causing the problem, even though all Michelin Energy and all the same mileage to within 800 miles.

They managed to find a replacement tyre with the correct mileage from a stock car and swapped with my original, and they say it should now be OK.

Although the deflation warning problem appeared with my car before the puncture, they say it was then a software problem, which has now been updated.

As things stand, any of these cars should always have tyres swapped in pairs for the system to work. The dealer acknowloges this is unnaceptable, and is pushing Honda to come up with something better.

having the same problems with 2017 yaris. just come in from checking all 4 tyres and reseting TPMS. hope the light stays off tomorrow been going on and off periodically for weeks. have already replaced two valves. they really are temperamental thing's