Hi, I have a 64 plate C-Max and the TPMS well all four tires batteries have run out. Do you know if it’s possible to have these replaced with regular valves or will it still show up on the warning lights?

Its a legal requirement for these to be working for the mot. so you will have to replace the affected sensors and have them programmed. Most tyre shops can do this. theres different types of sensors. so youd need to take a tyre off to find out which one you have. they arent cross compatible.

At that age of car (2014) isn't it correct that if they are fitted they have to work, but if they are not fitted they don't fail?

Surely you can just deactivate the system so there's no lights and no fail?

"Tyre Pressure Monitoring Systems (TPMS) became mandatory for all new cars sold in the UK/EU starting in November 2014, following an initial rule for new models from November 2012. This means any new car registered in the UK after 2014 must have a working TPMS, and a faulty system will cause an MOT test failure, as confirmed by UK law and MOT guidelines. 

Key Dates:

• November 2012: TPMS became mandatory for all new models of passenger cars.

• November 2014: TPMS became mandatory for all new cars sold in the EU (including the UK).

• 2015 Onwards: A functioning TPMS is a legal requirement for MOT testing on vehicles so equipped

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In Simple Terms:
If you bought a new car in the UK in 2015 or later, it must have TPMS, and if the warning light comes on, it's a fail at MOT time. "

So, I read that as:

A MK3 Ford Focus was introduced in 2011, before the mandatory requirement for TPMS fit on new models

If the car is registered before November 2014 you will get away with just deactivating TPMS

If you read the MOT manual, TPMS should only fail if the warning light is showing a fault.

Obviously there's room for interpretation there, but that does seem to make it difficult to fail where no light comes up at all...

yep, no light no fail

I had same issue with my 64 plate - batteries failed and light on. I had no intention of forking out for new valves and having them fitted - for scan plugged in and TPMS switched off. Car passed MOT with no mention and also passed the previous MOT with the warning light on. Another load of non essential crap that's not required. Just my opinion.