andrew64

TPMS Sensors not detected

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Hi All

I’ve recently purchased a 2016 Fiesta Zetec S. Since purchase I’ve had the message “tyre sensors not detected check handbook”. I thought this was because I had a slow puncture in a rear tyre and the two front tyres need replacing. I had this done today 3 new tyres after 12 miles the warning message came back on again. The tyre fitter told me to contact the main dealers. I’ve spoken to the Ford dealer in Inverness and they have told me it will cost £108 to check the fault plus any parts required. My questions are: -

Will it eventually detect the sensors if I keep driving it?

If it doesn’t is there a way to reset it myself, I’ve read a reset method using the start button but my car is key start only.

Thanks in advance for any help.

Andrew

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depends if you have TPMS which actually tells you the value of the pressure (in which case you have special type valves) Not that i can tell the difference, or the more simple TPMS which just shows a light and uses ABS to measure rotational difference of all 3 tyres.

So either your missing the tyre valves OR something much more sinister. Either way if there was anything to detect if should have done within 12 miles.

Either  it's specific button in the car you hold down to reset the warning OR its under Driver Assistance in your Trip Computer

 

EDIT: Just grabbed this from the Fiesta Owners Manual: Note:  Each road wheel and tire is fitted with a tire pressure sensor located inside the wheel and tire assembly cavity. The pressure sensor attaches to the valve stem. The tire covers the pressure sensor and it is not visible unless the tire is removed. Take care when changing the tire to avoid damaging the sensor

Looks like the sensor could be damaged or missing

 

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Thanks for that. You're right it appears each wheel and tyre is fitted with a sensor inside the wheel attached to the valve stems. Problem is I don't know which wheel has the damaged or missing sensor. Looks like it's going to need to go to either the Ford dealer or I wonder if someone like Kwik Fit might have the diagnostic equipment or if anyone knows an independent garage in Inverness I could try?

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the tpms diag tool is a generic tool, most indepenants should have one by now. have a look at each tyre valve and look/feel for a ridge around the rubber  valve. this indicates wether the correct valve is fitted for starters.

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on my fiesta it has the ridge on the rubber valve stem, but you can also tell it has something on the other end of the valve stem (the sensor thing). if i push the valve stem at an angle towards the outer edge of the rim I can feel something on the other end hit the inside of the wheel. Mind you I have 14inch steel wheels, I don't know if it would feel the same on a larger alloy or if there is more space around the inner end of the valve stem on those alloys.

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if the car is 2016 it should still be under warranty although I guess ford may allege damage done by previous owner/tyre fitter etc.  How long have you had the car? complain to where you bought it?  Bear in mind it will fail an MOT test like this.  I have seen for sale electronic boxes that you put inside the car that fool the TPMS system, so people can pass the MOT without sorting out problems inside the tyres. 

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Thanks All

Just checked and all four valves do have the ridges. I might try the Inverness Ford dealer again but they were already saying it's probably the tyre fitter that's done it so not holding my breath, just seemed £108 was a bit pricey. I got the car for my daughter so want to make sure everything works correctly and that it will pass it's MOT next year.

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nearly everytime its one of the sensors thats been damaged by tyre fitters. unusual for a sensor failure . 

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alot of dealers charge a minimum 1 hour diagnosis time. will take them all of 5 mins to find which sensor is faulty. then 30 mins max to take tyre off, replace sensor, refit tyre, etc etc. 

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is there any way we the public can work out which is the faulty one?  using OBD reader/Forscan or something else?

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It would have been easy to visual check the sensor when you get tyres changed. The system can be disabled using forscan. 

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Just to give you an update.

Took it in to Kwik-fit this morning they did the diagnostics for free. Turns out it was the rear offside valve sensor they reckon the battery in it was flat, sensor looked perfect to me. Replaced and all seems OK at the moment. I'm glad I didn't go to the main Ford dealer in Inverness and get ripped off.

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I don't understand why the car would fail its MOT if the tyre pressures were all correct.

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I am pretty sure it is in the new mot manual out this year. All new cars now have to have some sort of warning system for tyre pressures. So part of the MOT is to check it looks like it is behaving properly.  I do not know what the position is for cars which had the system prior to the compulsory fitting date. I am sure the manual will clarify whether it is to be checked on all cars with the system or only those made after a certain date (like it does with the reversing light check which is cars made after a certain date) but I have not checked today.

 

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TPMS checks are only on vehicles post 2012.  The manual isn't overly clear though...what's the difference between 'malfunctioning' and 'obviously inoperative'?  Surely both mean 'not working' but it's the difference between a pass with minor fault, or a fail due to a major. :unsure:  From what I've seen so far though, a lot of testers seem to know less about the new regs than we do! 😮 

  1. Tyre pressure monitoring system:
 
  1. malfunctioning or tyre obviously under-inflated
Minor
  1. obviously inoperative

Major

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this does seem a bit stupid, so if I take it in for MOT and the tyres all look OK but the warning light is on, is that inoperative or malfunctioning. doesn't anyone proof read that stuff and point out the problem before it gets issued

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so if the warning light is on its a major but if the light disabled in forscan and tyres at the correct pressure it should pass without issue?

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No, the tester should be checking that the dash light illuminates on ignition so disabling it will be 'obviously inoperative' which is a major (fail).  

Underinflated is only a minor weirdly, so even if the tyres aren't at the correct pressure it'll still pass with that, on the assumption that you'll rectify asap.

The confusing part is the 'malfunctioning' included in the minor fault.  If the light is permanently on or never comes on at all then it's obviously inoperative.  I don't see how you'd tell that it's just malfunctioning rather than being inoperative.

 

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