TPMS Amber MOT Fail

[roly79]

Morning All

Just trying to clarify if an Orange TPMS warning light in my 2016 Swift Sport will fail an MOT which is in a couple of weeks.
Pressures were fine when i checked but added a bit more to be safe with temps changing so now up to 35psi all round.
Normally a blast of air and a drive and it resets itself, but not this time
I have given them a squirt of wd40 to see if that loosens anything seized

The system does not indicate which tyre/sensor is at fault so would it be a case of all tyres off to replace sensors till faulty one shows up ?

I have read that its only an MOT fail if tester proves the TPMS system is at fault, if a warning light is on they will move on to check tyre pressures
if a tyre or tyres are under pressure then TPMS is doing its job and just needs resetting by driving so will pass.

Can i really let 10-15PSI out of a tyre so the tester assumes my system is working and issues a pass.
If so thats what i will do but thats bonkers lol

Any MOT testers out there please to help

[Smurfsarepeopletoo]

TPMS checks were added to the MOT test checklist in January 2015. Since then, you can receive an instant MOT fail if the TPMS dashboard light stays on to indicate a fault or problem with the TPMS valves.

[RUI488]

The tester has to be SURE the TPMS warning light is indicating a fault and not just doing its job (showing a discrepancy in tyre pressures across the vehicle).
I dare say some testers will pass and advise (that’s changed slightly), and some will fail.

Edited to add; i’m not sure many testers will go to the trouble of setting all the tyre pressures and attempting to reset the system.
They’re going to either pass or fail it.

[Rough101]

I doubt it has any sensors if it can’t read wheel by wheel, it probably works on the basis of wheel speed differential.

If so, inflate all correctly, reset via the dash and then drive on a straight road for a few miles to reset it - or whatever the manual tells you.

[Sheepshanks]

roly79 said:

I have given them a squirt of wd40 to see if that loosens anything seized

Where exactly did you squirt WD40?

[anonymous-user]

This is for 2017 might be the same for 2016

[andy43]

Sheepshanks said:

roly79 said:

I have given them a squirt of wd40 to see if that loosens anything seized

Where exactly did you squirt WD40?

Dashboard?

[RicksAlfas]

Can you access the computer display on that version of the Swift?
Is there a button sticking out of the dashboard which you push in and turn?
Looks like an odometer reset button?
That should allow you to access the TPMS menu.

[MustangGT]

RUI488 said:

The tester has to be SURE the TPMS warning light is indicating a fault and not just doing its job (showing a discrepancy in tyre pressures across the vehicle).
I dare say some testers will pass and advise (that’s changed slightly), and some will fail.

Edited to add; i’m not sure many testers will go to the trouble of setting all the tyre pressures and attempting to reset the system.
They’re going to either pass or fail it.

According to the rules a tester has no obligation to do anything other than carry out the MoT. A TPMS light staying on is a fail.

[Every day a journey]

Sorted

[cuprabob]

Might be worth posting on this thread.

https://www.pistonheads.com/gassing/topic.asp?h=0&...

[TooLateForAName]

Pretty sure its a fail.

If it has sensors in the tyres then it may be the batteries are flat and they need replacing.

If it uses wheel rotation then you could have an issue with a wheel speed sensor - in which case you can expect abs and traction control lights to join the disco.

[Little Pete]

roly79 said:

Morning All

Just trying to clarify if an Orange TPMS warning light in my 2016 Swift Sport will fail an MOT which is in a couple of weeks.
Pressures were fine when i checked but added a bit more to be safe with temps changing so now up to 35psi all round.
Normally a blast of air and a drive and it resets itself, but not this time
I have given them a squirt of wd40 to see if that loosens anything seized

The system does not indicate which tyre/sensor is at fault so would it be a case of all tyres off to replace sensors till faulty one shows up ?

I have read that its only an MOT fail if tester proves the TPMS system is at fault, if a warning light is on they will move on to check tyre pressures
if a tyre or tyres are under pressure then TPMS is doing its job and just needs resetting by driving so will pass.

Can i really let 10-15PSI out of a tyre so the tester assumes my system is working and issues a pass.
If so thats what i will do but thats bonkers lol

Any MOT testers out there please to help

I would advise it. We have to be sure the lamp is indicating a system malfunction before we can fail it. If the lamp flashes for a few seconds, or if there is a message on the dash saying there is a malfunction as well as the lamp, then I would fail it.

[Sir Bagalot]

Smurfsarepeopletoo said:

TPMS checks were added to the MOT test checklist in January 2015. Since then, you can receive an instant MOT fail if the TPMS dashboard light stays on to indicate a fault or problem with the TPMS valves.

Incorrect.

The light will tell you of a fault, or incorrect pressures.

We have a shed where such a light is on so I asked MOT bloke. His reply was it could indicate incorrect pressures, as long as he doesn't see the words TPMS system fault, or similar, then he will assume it's a tyre pressure issue.

If asked I was told to say that the pressures were wrong

[roly79]

Thanks everyone for your suggestions, light has now reset through a combination of
Setting the TPMS on the dash back to comfort mode the lowest PSI as apposed to ECO or Loaded
It was set to this but at some point car has changed this setting.

Pumping all tyres up to 38PSI more than i would like but if light off will pas MOT so can let some out after.
Drove 100 yards down road with the high pressure in and light went off

Interesting that you guys reckon it is only an MOT fail if Tester proves its a system fault, so my theory you could go in with one under inflated tyre and blame it on that does seem to stick.

Crazy rules we seem to follow

Thanks all

[trickywoo]

Sir Bagalot said:

Incorrect.

The light will tell you of a fault, or incorrect pressures.

We have a shed where such a light is on so I asked MOT bloke. His reply was it could indicate incorrect pressures, as long as he doesn't see the words TPMS system fault, or similar, then he will assume it's a tyre pressure issue.

If asked I was told to say that the pressures were wrong

I had exactly the same conversation with a mot tester.