NemesisUK

Definitely the way to go but be wary of very low sample numbers?

There are two common systems for providing tyre pressure loss warning. The ABS relative rotational speed system, a change in relative rotational speed of one wheel compared with the other three can indicate a change in tyre pressure. No individual pressures are reported. A simple warning light is displayed. The second is the use of valve pressure sensors, constantly reporting pressure and temperature of each tyre. This system can report individual pressures if the manufacturer so desires. It seems Lexus use this system across the ranges but only implement it's full capabilities in certain models. Perhaps to differentiate those models? AFAIK the former (ABS) system is the minimum required to comply with current EU regulations.

Great stuff @Comedian Now factor in corner loading and unsprung weight? There must be a minimum stiffness to support the weight of the car but I suppose the damper will play a larger part in controlling the unsprung weigh? In my simple mind springs support the car, dampers control the ride. There's a great deal of interaction between the two to provide the final driving 'experience' and factor in adaptive damping (AVS in Lexus speak) and there's another complication in the system design. Which brings us back to @B1RMA initial question/concern?

But as @rayaans says, one doesn't have to 'reset' the system. Simply correct the tyre pressures and the light goes out. Only time one needs to reset is if, for example, one fully loads the vehicle and increases the tyre pressures in accordance with the handbook recommendations. Resetting using the button just tells the system the current pressure readings are the benchmark values.

Your dogs sleep in a draw??!! 😁

My RC can display the pressure for each tyre individually. Did the BMax have valve pressure sensors, or was it the indirect system?

Seconded ... I've always fitted matched sets of springs and shocks. Regarding the warranty, I would almost guarantee Lexus would void any cover of the AVS system if non-Lexus approved springs were fitted..

You say the pressures were OK? So why did the TPMS light come on? The light coming coming on would indicate the pressure it is monitoring has dropped below the level set during initialisation. Does your model display the actual tyre pressures?

An example of what these companies publish on their websites regarding DPF removals, putting the onus on the customer ... IS DPF REMOVAL LEGAL? Please note that we only offer DPF solutions for Off-Road Usage only. Although it is not illegal to remove a DPF filter form your vehicle, it is an offence under the Road vehicles (Construction and Use) Regulations (Regulation 61a(3))1 to use a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet. Removal of a DPF will almost invariably contravene these requirements.

Looks like your model doesn't display individual tyre pressures. It's a simple fault indication with warning light. Your handbook also doesn't indicate one can register two sets of ID codes, implying one will have to get the dealership to swap the wheels over come spring and register that set of ID codes to the system again. My apologies, my posts above don't appear relevant to your model.

That Xmas present is going to take some wrapping!! Christmas can't come quickly enough, enjoy..

Firstly, it's illegal and an MoT failure. What's the problem with the DPF?

Have a read of this thread on the same subject

In the MFD in the cluster, you will have to scroll through the various options.

The correct pressures are being displayed?

Steering wheel is on the wrong side!!

This of any use? http://wltpguide.uk/details/Lexus/IS/IS 300h Premier CVT?clk=48&UCID=7837437

RC, obviously!!

I regularly clear the cache and cookies from my browsers. Keeps things fresh and snappy, plus flushes out all those tracking cookies and PUPs

Not if your model/year car can accept two sets of codes, see my post further up. I'm thinking Swindon didn't quite follow the correct procedure when registering the new codes..

The registration must be done via Techstream, my handbook merely mentions the fact two sets can be registered, for when swapping summer/winter wheels. "It is not necessary to register the ID codes when replacing normal tires with snow tires, if the ID codes for the wheels of both normal tires and snow tires are registered beforehand." It directs one to contact the dealership to perform the registration and change-over. Lexus tech doc is the only place I found with info on the 'three press' process This is the doc in question, obviously directed at my model and year, so may not be relevant to others. Tyre Pressure ID Registration.pdf

On my 2016 RC one can register two sets of wheels with TPMS valves to the system and when swapping from one set to the other one has to tell the system of the switch by pressing the TPMS reset button three times within three seconds. I also read in one of the technical docs that for the car to recognise a second set is being registered to the car the first set must be within range so as not to be replaced by the new registrations.

All I do is place my key in a Faraday cage. The spare is switched off. The driveway is gravel and the dog hungry....

Do you need to do anything to tell the car which set of TPMS valves you are using?

Trouble with only one axle having winter tyres is that one axle will always be the wrong one for a given scenario.