I have a Skoda Octavia Mk3 (essentially a VW mechanically) which started to give false warnings about loss of tyre pressure after about 60k miles.

It used to work well, and correctly warned me when a slow puncture had reduced the pressure in one tyre from 36 to 28 psi.

But now it is giving random false warnings on one or the other rear tyre, sometimes twice in one day, sometimes once a week. There is never anything actually wrong with the tyre pressures. I check them and make minor adjustments once a week, and reset the detector system.

The detection system is the passive kind. There are no actual pressure sensors but the system uses the wheel rotation speed (off the ABS sensors) to determine if one is turning consistently faster than the others.

I asked at my garage. They said that if the fault is in the ABS sensor(s) there would be other warnings coming up. I asked them to clean the ABS sensors on the rear wheels. They said they can't because they are integral with the hub and so are inaccessible.

Does anyone know of any cause or how to fix it?

  • Are you getting any errors on the DIS for the TPMS itself as opposed to low pressure warnings? – motosubatsu Oct 15 '19 at 11:28
  • @motosubatsu I just get the tyre pressure warnings listed (as well as the instrument warning light) until I reset the sensing system. There is also a brief pop-up message on the instrument panel at the moment of detection, and a ping. Then every time the engine is started, the instrument warning repeats until I reset. – Weather Vane Oct 15 '19 at 11:40
  • It the tyre wear equal on all wheels? – HandyHowie Oct 15 '19 at 11:47
  • @HandyHowie yes, pretty much side to side, newer on the front. Sometimes it flags the rear left, sometimes the rear right. On one occasion it flagged all four tyres and I can't see how that can be possible when it is comparing their rotation speeds. And when I reset the system, it should recalibrate anyway, and adjust for any small differences (presumably by comparing their rotations over the next 1/4 mile or whatever). – Weather Vane Oct 15 '19 at 11:51
  • I've had mine (2011 Audi so likely the same basic system) flag all four before a few times and usually it's when it thinks there's more than one of them out of expected norms - I assume when it's getting different readings from multiple wheels that it can't work out a real baseline and throws a fit. Does your Octavia have stability control? – motosubatsu Oct 15 '19 at 11:55

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