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.

 

[GeeJayW]

Been having similar issues with our S205. Car went in for annual service on Thursday with TPMS inoperative warning. Dealer replaced three of the sensors and reset the system. Dash showed TPMS operative, but then after a few minutes driving the orange TPMS inoperative message pops up again. Went back this morning, they tried another reset, same outcome after a short drive. Will be going back on Monday.

 

[OneForTheRoad]

Been having similar issues with our S205. Car went in for annual service on Thursday with TPMS inoperative warning. Dealer replaced three of the sensors and reset the system. Dash showed TPMS operative, but then after a few minutes driving the orange TPMS inoperative message pops up again. Went back this morning, they tried another reset, same outcome after a short drive. Will be going back on Monday.

You'd think they'd of done all 4 . I bought 4 off eBay for £68 for my new alloys , working a treat.

 

[GeeJayW]

You'd think they'd of done all 4 . I bought 4 off eBay for £68 for my new alloys , working a treat.

Yes, i did ask why not change all four, eas told it wasnt needed. Will get them to put a fourth sensor in when the car goes back in on Monday.

 

[OneForTheRoad]

Yes, i did ask why not change all four, eas told it wasnt needed. Will get them to put a fourth sensor in when the car goes back in on Monday.

Saves you a job later on when it's battery dies . Better to have all 4 reinstated together id of thought.

 

[GeeJayW]

Update, the dealer techs were able to resolve this problem today, apparently a software issue with the ESP system… Anyway, all working now.