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Discussion Starter · #1 ·
Bought a 15 plate B Max 1l eco thingy a month back and other than an issue with the TPMS sensors are very happy.

The garage that sold it has tried to fix the issue by applying a shed load of sealant to the rims but away on hols this week and it triggered again. Nieces boyfriend works for a Ford restoration company and has good relationship with the next door Alloy Wheel fixers and restorers. They showed me that only 3 of the wheels had the sensors and one was seriously damaged. Oh and they were cheap ones too. Fitted 4 new ford ones, cleaned and reseated tyres etc and error disappeared.

Until yesterday, some 2 days after when we got a popup saying:

Tyre sensors not detected.

Have reset but not driven since. Is this likely to be something simple or are we doomed to more expense?

Also, any advice needs to come from the point of not needing master key as seller still hasn't found that.!!!! And we didn't realise until we'd got her home we'd need it.

TIA
 

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As for the master key, I'm unsure what you mean as my bmax has an old fashioned flip key not the keyless entry. If you have a flip key like me, then there isn't a master key, just 2 flip keys. Although in the service pack book, you do get a keycard (bit of paper) with the key number on it, should you ever wish to purchase a new key.
As for the Tyre Sensors, once fitted with NEW batteries (CR2032 I do believe) then the new tyre pressure sensor has to be "coded" to the car with a device that looks quite similar to a cable finder, but much smaller. If you are just replacing the batteries then this "coding" step doesn't need to be carried out.
On a bit of a note, if your tyres are losing air and the garage has been a little over zealous with the sealant, then the leak could well lie around the valve area of the alloy wheel, as some ford wheels are prone to corroding around there, even if, like me, you haven't ever had the valaves out.
 

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Is there really a leak or is it just the sensors? I never trust sensors anyway and prefer to check tyres the old fashioned way from time to time.

I certainly wouldnt spend any time or money fixing something minor on a used car.

Of course if there is a genuine leak, I would replace the valve of the leaking tyre after checking for stones, nails and screws first.

Alloys can corode around the rims, but personally, I have never encounterd this problem, but know one or two wh have on older models.
 

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On my other car I had a sensor problem last week. Due to the colder weather the pressures had dropped causing the warning light to come on.
The dealer told me it is a very common issue. You need to do a reset, before re-inflating tyres. The sensors are very sensitive.
 

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Discussion Starter · #6 ·
welcome

what do you mean master key?
you should find a metal key in the remote control, hidden behind the ford badge.

I don't know if it is called something else but when we try to unset the MyKey option it tells me we need the 'master key'.

That isn't my main concern though at present as hopefully the garage will find it and if not they will be paying for a new one.
 

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Discussion Starter · #7 · (Edited)
As for the master key, I'm unsure what you mean as my bmax has an old fashioned flip key not the keyless entry. If you have a flip key like me, then there isn't a master key, just 2 flip keys. Although in the service pack book, you do get a keycard (bit of paper) with the key number on it, should you ever wish to purchase a new key.

Please see my response to Gremlin but it is what the display is telling me... bigger concern is the TPMS though.

As for the Tyre Sensors, once fitted with NEW batteries (CR2032 I do believe) then the new tyre pressure sensor has to be "coded" to the car with a device that looks quite similar to a cable finder, but much smaller. If you are just replacing the batteries then this "coding" step doesn't need to be carried out.

The original 3 sensors have been removed by a company that do nothing but alloy wheel repairs, rebuilds, etc. Wheels and tyres are their business. They have put in 4 brand new sensors. They cleaned all the old crap sealant off and all appeared well until the:

Tyre sensors not detected.



popped up. It's that NOT DETECTED bit that I'm really asking about. Would that be trying to talk to the spare wheel which we didn't know about until the day we picked it up and my thought is is the system also checking the spare due to some sensor in the boot or similar?

If not, then any other suggestions as to why it says "not detected" would be most welcome? I'm hoping to get the car back to the alloy & tyre folks tomorrow.



On a bit of a note, if your tyres are losing air and the garage has been a little over zealous with the sealant, then the leak could well lie around the valve area of the alloy wheel, as some ford wheels are prone to corroding around there, even if, like me, you haven't ever had the valaves out.

I guess I wasn't clear enough as I was doing the initial post via my mobile. Apologies.

 

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Discussion Starter · #8 ·
I certainly wouldnt spend any time or money fixing something minor on a used car.
You say not to worry about minor issues but as I understand it, this is an instant MOT failure?

Of course if there is a genuine leak, I would replace the valve of the leaking tyre after checking for stones, nails and screws first.
I hear that - not seeing any new loss of pressure now whereas I was before. Brand new sensors and wheels all checked and tested by the alloy wheel specialists as hinted at in my original post


Alloys can corode around the rims, but personally, I have never encounterd this problem, but know one or two wh have on older models.
I am aware of corroding alloys but like you never had that issue in >30yrs.
 

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Discussion Starter · #9 ·
On my other car I had a sensor problem last week. Due to the colder weather the pressures had dropped causing the warning light to come on.
The dealer told me it is a very common issue. You need to do a reset, before re-inflating tyres. The sensors are very sensitive.

Thanks for the suggestion - we have been resetting on a daily basis after checking tyre pressures each morning when cold.



I suspect this is something much more than that though as these are now brand new sensors in all 4 tryes not just 3 as it was originally and the message has gone from a warning that pressure has dropped to saying 'not detected' - and this after approx 60 miles plus of driving.
 

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Discussion Starter · #11 ·
Have you tried the main dealer, give them a ring, some fixes can only be done by them.
No, not yet, but then the seller is allegedly doing that on our behalf.... I'm happy to give him some time to sort everything but in the meantime trying to find answers and potential ammunition.
 

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Has the issue being resolved? If not any decent tyre fitting garage will have the device that looks like a cable finder to "re align" the sensor to the ecu.
 

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Discussion Starter · #15 ·
Has the issue being resolved? If not any decent tyre fitting garage will have the device that looks like a cable finder to "re align" the sensor to the ecu.
Thanks for the ask - yes, it has been fixed. As mentioned I did pop in to a local (to our holiday destination) specialist (Widnes Alloys Autocare) as they are next door to my nephews Ford restoration / repair shop and came well recommended. They also gave me a decent price which I am now in the process of trying to claim back from the car sales folks who have until next Tuesday to pay before I start a small claims.

The result of Widnes Alloys investigation was staggering really: not only had the original fix (we were told leaky rims) not worked they clearly couldn't have done a proper job as it turns out that only 3 of the tyres even had a sensor. So after their "fix" of the leaky rims, they simply can't have re-trained the system. Had they done so, then they would have had to know.

It beggars belief that there are still firms out there that do this sort of sh&*(! and expect not to be found out.
 
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