Hi All, 2017 150 diesel 4x4 DSG, with about 70,000 miles on it.

Repeated tyre pressure warning, but a gauge confirms the pressures are all correct?

Any thoughts, please?

Are the pressures all correct if you stop as soon as you can when the warning shows. In a safe place. Check when hot that there is no sticking brake caliper or bearing going and the hub, wheel heating and a tyre expanding. The warnings are not always a loss of pressure / circumference.

1 hour ago, Evolution13 said:

Are the pressures all correct if you stop as soon as you can when the warning shows. In a safe place. Check when hot that there is no sticking brake caliper or bearing going and the hub, wheel heating and a tyre expanding. The warnings are not always a loss of pressure / circumference.

Thanks. Good thought, but I set them all to 2.5 Bar cold, zeroed the pressure monitor, drove it round the block, and parked it up overnight. Next morning, as soon as I started the engine, I got the bong of doom and the light. Stopped the engine, hopped out, and tried all the tyre pressures again. All still at 2.5 Bar.☹️

Repeat.But, With a longer drive.

58 minutes ago, Evolution13 said:

Repeat.But, With a longer drive.

Wife's taken it to Carlisle this evening (about 40 miles away. The light came on again. She re-set it when she got there and she's on her way home now. I'll report back!

Could be a failing bearing/ABS sensor/ABS ring or wiring. From memory the car uses info from ABS sensor to work out if a tyre is flat. Maybe worth getting it scanned in case a fault code is stored or if faulty which wheel/wheel sensor it is

Alasdair

It uses the sensor to see if the circumference / rotations changes up as well as down. So not just loss of pressure since being set. An increase can trigger the TPMS. And all tyres losing pressure might not trigger the TPMS.

Thanks both.

Re. the longer run, it came on when the wife was driving to Carlisle. She re-set it when she was there, and then it did NOT come back on on her trip home.

Re. getting it scanned, I have OBDeleven, so I'll try that at the weekend and see what it says.

Have a good check of the tyres. My old Seat altea warning used to come on due to a tyre being slightly out of round. I kept resetting and checking but didnt notice tyre at first an assumed it was a sensor but after a few weeks car developed a wobble you felt through seat and one was slightly deformed. I jacked each wheel up and lowered onto a flat board with tyre just touching then spun wheels and found one was about 1cm out of round with a weird twist in it. Expensive day as the tyre service pointed out the age of tyres and said I needed all four as if one had gone the chances are the others may follow. I trust the tyre place. They are decent and have been using them for at least 40 years.

Alasdair

Hi All, Just a quick update. OBDeleven gave two fault codes:

C102D00 and C1146F0

Do either of those mean anything to anyone, please?

Hi,

A quick search on ross-tech.com forum gives following possible issues:

• VCDS coding modifications on ABS module

• Wheel speed sensor calibration issue

Otherwise, each time you've adjusted tyre pressure, did you reset the TPMS on the MMI? It may sounds stupid, but better start getting rid of very simple and costless things.

Thanks Bap.

Yes, TPMS reset. Given that the error message isn't the same each time, it's either "right hand front tyre" or "TMPS fault", I'm leaning towards the right hand front wheel sensor. It also says "unable to store values" (or something like that) on some occasions when I try to reset the TPMS, it also points to a fault. I'm certainly not brave enough to try any VCDS coding, so it's not that! It does have an aftermarket towbar with dedicated electrics (not installed by me), but it's had that for several years and it hasn't been a problem.

I'll leave it a bit longer and see if the right hand front tyre message is consistent every time. I think there's a way of using OBDeleven to monitor live data? I might try and go for a drive to see if it can display the data from the 4 wheel sensors?