More tpms woes.

My guess would be that either one sensor is not very strong, or it's output is not very 'clean' and the TPMS unit in the car mis-reads it.

Probably the best you can do is put the set of wheels on that all work for the MOT and just put a bit of tape over the light at all other times.

Years ago l had a 1989 Porsche 828 S4 and the TPMS never missed a beat on that.

I took it to Kwik Fit to have four new tyres fitted, the fitter took the tyres off and hammered the sensors off the rims, thinking they were some kind of balance weight.

lt cost them £2,000
Nothing was cheap on that Porsche.

MOT due shortly (for 2019 G4 model) and cold weather has been rather harsh all week. TPMS warning constantly flashing up and causing panic with family members - especially on regular runs to hospital. System sorts itself when outside temperature rises but then goes back to 'Warning' mode when we get close to freezing point. Checked tyre pressures and all tyre pressures are fine - Seriously irritating! Pragmatic solution sought and hoping MOT station doesn't fail vehicle if the ambient outside air temperature is close to freezing on MOT test day. Other than that I've been a happy Suzuki customer for the past 4 years

wrote:

System sorts itself when outside temperature rises but then goes back to 'Warning' mode when we get close to freezing point. 

Have you checked the tyre pressures when the TPMS warning is lit?  Not to state the obvious, but tyre pressure varies directly with temperature.  

That's why car forum TPMS posts always pop up around the end of fall / beginning of winter...  





















 

Does the TPMS show the actual pressure or just that it is below the minimum?

Would a tyre pressure below the minimum give rise to a MOT failure, surely the garage would check it with a relaible calibrated gauge, not relying on a £5 bit of electronics?

It could also be the sensor's ability to read accurately below 0C,

Do you only get the warning at start up? After a journey your tyres will warm up a bit?

Finally type pressure can decrease by as much as 10psi in really cold weather, so what is the minimum alarm level you can set?

It's a bit warmer just now, so if it goes after a decent trip, just take the long way to the MOT centre and hope they get your car in promptly.

When the temperature drops and I get the warning light, I just top up to the correct pressure while tyres are cold. That sorts it out.