TPMs Fault

[Mickyh7]

I have a SLK250d 2015.
TPM warning told me front left not being picked up.
I expected a battery to be dead.
Took the car to my local tyre place, who read all 4 sensors, and told me they were all OK.
Now the car won't recognise any of the tpm sensors, and it seems to have froze up.
As if it was calibrating perhaps ?
I still have the orange warning light on the dash though, flashing on start up, then solid.
Any ideas or tips on a way forward please?
Many thanks.
Mick.

 

[OneForTheRoad]

They last about 10 years , so a 2015 car will obviously be needing new ones about now. There's no way of testing them tbh , a code reader will simply give a standing voltage , it's no indication of battery life.

Swap your front wheels and see if the fault moves to the front right, check and adjust tyre pressure and reset the tpms monitor , drive for a few miles and see what happens.

 

[Mickyh7]

OK thanks for that.
Swapping front wheels around sounds like a good idea, then following the fault!
It was showing the 3 other pressure's until they checked them, now none.
I thought it would start working within a few miles?
Perhaps I need to drive further.
I'll do this today before I do anything else.
Cheers Mick

 

[Diesel Benz]

OK thanks for that.
Swapping front wheels around sounds like a good idea, then following the fault!
It was showing the 3 other pressure's until they checked them, now none.
I thought it would start working within a few miles?
Perhaps I need to drive further.
I'll do this today before I do anything else.
Cheers Mick

Did you try to reset TPMS from the instrument cluster menus? Not sure if a 2015 car should already automatically identify new or differently placed sensors. You should drive more than 3 miles after a reset (perhaps the garage did that). After reset the cluster menu should show something like "please wait, TPMS initialising".

 

[OneForTheRoad]

OK thanks for that.
Swapping front wheels around sounds like a good idea, then following the fault!
It was showing the 3 other pressure's until they checked them, now none.
I thought it would start working within a few miles?
Perhaps I need to drive further.
I'll do this today before I do anything else.
Cheers Mick

If your tyres are directional tread, be sure to swap them back after the test

 

[Mickyh7]

Just to close this, I swapped the front wheels around, hit the motorway, reset the warning, and within 2 miles, ALL of the tyre pressures are showing correctly.
Success for now, but I guess the TPMs batteries are on their last legs, and couldn't connect because of the distance involved between sender and receiver?
Thanks for your help guys.

 

[Mickyh7]

And it's lost its new connection today.
Booked in for a new TPM tomorrow afternoon. I'm now expecting the other three to give up any time soon!
£80 each fitted.

 

[rf065]

And it's lost its new connection today.
Booked in for a new TPM tomorrow afternoon. I'm now expecting the other three to give up any time soon!
£80 each fitted.

Pretty sure they are supposed to last only 7 to 10 years, I think for a 2015 car I'd just get them all changed at the same time.

 

[Mickyh7]

Three might have been changed before I bought the car?
I'll do them as they fail.
But cheers.

 

[OneForTheRoad]

And it's lost its new connection today.
Booked in for a new TPM tomorrow afternoon. I'm now expecting the other three to give up any time soon!
£80 each fitted.

You can buy an emulator now , it just sits in the glove box and your tpms system sees it instead of tyre sensors.

Good thinking about the other 3

 

[Mickyh7]

I like that idea.
I can check my own pressures every week like back in the day!

 

[OneForTheRoad]

I like that idea.
I can check my own pressures every week like back in the day!

The dash shows you pressure after a few miles of driving. The emulator does away with having to replace the tpms valves.