Ford F 150 Recall

Hah, I wish my Tacoma had that "feature". Damn light is forever if you don't shell out a lot of money for new transmitters when the batteries die after about 10 years!

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Same here For what should be a few dollars I was asked for about $ 70 per wheel. Just like the high price of the fobs that many cars are now using.

tens seconds with google find 4 sensors for $30 at walmart.....

Most late-model cars will show you the tire pressure of each tire on the dash display, also.

It's annoying when on occasion they rotate the tires but then forget to reprogram the computer so it knows what wheel which sensor is on, this requires a tool:

Then how much to get them installed ?

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There are some systems that DON'T place pressure sensors on the wheels. They, instead, detect "low pressure" by noticing the different rates of rotation of the tires (based on the ABS sensors). ("poor mans TPMS")

These "self calibrate", in a sense. Move a low tire and it will see that the new location is rotating with an effective smaller diameter than the others and flag *it* as being low (regardless of where it was previously located)

I've been told in the Teslas, the sensor is mounted so it passes close to a pickup that both inductively couples for transmitting a signal, but also to supply power to the sensor. That is why the tire pressure won't show up until you are something like a quarter mile down the road. It needs a few rotations to fire up the pressure sensor.

Sounds like the article states the cold tire pressure was set at 35 psi instead of 42, meaning the low pressure warning threshold is low by about 7 psi, meaning you're not going to get a warning for a low pressure that causes loss of control. When Ford says loss of control they really mean it.

The rims I use for the studs in the winter don't have sensors so I'm used to the light being on. I'm also used to the slow leaker that needs airing up every month or so.

The last time I got a new set of tires I foolishly thought I would miss the ever popular valve stem charge. Nope, they charge for 'rebuilding' the transmitter.

$62.50 per wheel...

On late-model cars you can use two fobs to program infinite additional blank fobs.

If you've lost a fob and only have one then things get real interesting. In theory in the US you only need one fob to make a second (vs Canada where you need at least two to do anything) however the process for programming a replacement yourself on Chevy cars at least becomes 10x more byzantine with only one, and the chances you brick your remaining fob and/or brick the car trying to do it yourself are IMO at least 50/50.

I just called a locksmith the time I was in that situation.

ABS has to sense small changes in rotational speed to determine the onset of a skid. So, that sets the threshold for how "flat" a tire can be and be noticeable.

Not sure if detecting all four in an identical -- but over/under-inflated state -- would be possible without another reference. E.g., if you had a road facing camera (like for lane monitoring), you might be able to deduce speed over ground and compare that to the "sensed" speed based on tire rotation (assuming the dashed lines on roads have some standard governing their spacing?)

Seems like an ideal application for vibrational/piezoelectric energy scavenging e.g.

So 3xn^2 + 5=42 gives you n=3.51... So it wasn't that. Somebody knew what they were doing and put the vehicle deep into loss of control without warning operator. Loss of control is a conditional parameter, operator doesn't know about it until the vehicle is maneuvered.