TPMS Question.

[ttsig]

On my car the warning is on the instrument cluster above the steering wheel, and you cannot monitor MPG, Distance to empty, etc when the TPMS warning is on (to the best of my recollection). That is what I meant when I said you cannot use the other instrument cluster functions when the TPMS warning is on. But not sure about Tech Package.

You're memory is pretty much correct. You can still "glance" at the MPG, distance to empty, options by pressing the button, but in just a few seconds, it will go right back to the TPMS warning display.

 

[ASHDUMP]

Thanks guys. Sounds like I'll be needing the TPMS because that would be something that would annoy the hell out of me.

 

[ASHDUMP]

Just called tirerack. they have them for $52 each. Is that a good deal? I guess it would be since I don't have other options.

 

[moose66]

Have you tried calling a dealership to see what they sell the OEM sensors for? Also could Tire Rack tell you whether or not the sensors were install and go? Meaning you don't have to go the dealer to have them do any type of reset?

 

[Hghwy52]

The Genesis sedan (coupe is different) uses TRW 52933-2F000 http://www.hancousa.com/Dill Application Chart.pdf

I called a dealer a few months ago and was told they were $38.50 each.

I know that if pressure is low in a tire, the TPMS light is on and the LCD display shows which tire is low. My question is what if all four sensors are missing - does only the TPMS symbol light up or does the LCD display show a car with all four wheels flashing? If it's just the yellow warning light, it can be covered with a piece of black tape.

 

[ASHDUMP]

I just ordered some winter tires from discounttiredirect.com with TPMS sensor. The sensors were $56 each but had free shipping for everything along with tires that were cheaper than tirerack.com

I got Falken Eurowinter HS439 to put on my factory 18" V8 rims. I've never owned two sets of tires before...

 

[ttsig]

If you're going to put them on your same rims do you really need new TPMS sensors? I assumed you were getting them for a second set of rims.

 

[Onedurwho]

I'm with MGRIG as I too had the Chrysler 300. The magnet stayed on the spare in the trunk (it was donut shaped and just "stuck" around the valve stem). When you rotated the tires you had to take the magnet from the trunk, place it around the stem of each tire and go through a programming ritual so the system could identify each wheel. The horn would blow to let you know it had "learned" a new trick, uh, tire.

 

[ASHDUMP]

If you're going to put them on your same rims do you really need new TPMS sensors? I assumed you were getting them for a second set of rims.

I bought a used set of OEM rims off ebay that were "take-offs". So does anyone know about rotating the tires on the Genesis? Is there a magnet to look for in the trunk? I'll have to read the manual.

 

[ttsig]

I've rotated my tires myself. The TPMS system appears to be "autolearning". I actually intentionally lowered the pressure to setup TPMS indicating the front passenger tire was low, then rotated the tire in this state. Withing a 30-45 seconds after starting the vehicle alerted me that the rear tire was low, just as it should.

I'm not sure if what happens if you put on totally new TPMS sensors, but I think it'll just autolearn those as well, but I've not done that so it's just a guess.

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[taxicab]

Bummed by TPMS

This was the only thread I found on the TPMS. Does anyone know if there is a way to reset this warning without going to the dealer? The closest dealer is 1 1/2 hours away, and now that it is getting colder here in the mornings, my warnings have come on, and they don't go away as the tires warm up. The tires are fine (even filled with nitrogen, but obviously there is shrinkage there too). If I have to go to a dealer for this, it is a MAJOR bummer, since I expect more than one cold winter morning this year.

 

[blasterguam]

Even with nitrogen in the tires they can still activate the TPMS if it gets cold enough, but most likely it is because you have a very, very small leak. In the other post I said to just pump them up if you needed to make the TPMS go off...but now I see you are running with nitrogen. It's not like you have ZERO air in there already or you're using your car for NASCAR-like applications, so I would just add a little air and you're back up and running! At the end of the day the correct amount of pressure will be the same in the car no matter what gas is inside, and although the inert nitrogen will be far less susceptible to thermal fluctuation, most of us will not see the difference.

 

[taxicab]

Even with nitrogen in the tires they can still activate the TPMS if it gets cold enough, but most likely it is because you have a very, very small leak. In the other post I said to just pump them up if you needed to make the TPMS go off...but now I see you are running with nitrogen. It's not like you have ZERO air in there already or you're using your car for NASCAR-like applications, so I would just add a little air and you're back up and running! At the end of the day the correct amount of pressure will be the same in the car no matter what gas is inside, and although the inert nitrogen will be far less susceptible to thermal fluctuation, most of us will not see the difference.

I'm not convinced it is that easy. Thanksgiving night, at a higher elevation here in the mountains, 3 of 4 tires indicated low pressure when I started the car, as the temperature had plummeted. Back in warmer climates, all tires looking fine, the warnings remain on. I don't think they turn off by themselves, so the question is really on how to reset the sensors. I have no problem putting air on top of the nitrogen, but low tire pressure is not the current problem. But driving 1 1/2 hours to the dealer after every cold morning is not going to be fun!

 

[Mark_888]

At the end of the day the correct amount of pressure will be the same in the car no matter what gas is inside, and although the inert nitrogen will be far less susceptible to thermal fluctuation, most of us will not see the difference.

Hmm. Maybe I am wrong, but I thought that Boyles Law (the volume of a gas is proportional to its temperature) applies pretty much to all gases.

I have heard that nitrogen is less prone to slow leaks than air because the nitrogen molecules are larger than O2. This does not apply to actual holes in a tire, but only leakages through the rim edges, etc.

 

[Mark_888]

I'm not convinced it is that easy. Thanksgiving night, at a higher elevation here in the mountains, 3 of 4 tires indicated low pressure when I started the car, as the temperature had plummeted. Back in warmer climates, all tires looking fine, the warnings remain on. I don't think they turn off by themselves, so the question is really on how to reset the sensors. I have no problem putting air on top of the nitrogen, but low tire pressure is not the current problem. But driving 1 1/2 hours to the dealer after every cold morning is not going to be fun!

Next time that happens, take a air pressure reading of your tire with a digital gauge (don't wait until you start driving). My warnings go on at about 29 PSI. Since you loose about 1 PSI for each 10 degrees F drop in temperature, a tire that is set to 33 PSI at 70 F will be at 29 F when the temperature drops to 30 F.

I have noticed that when the warnings come on, and the tire is then properly inflated, it still takes about 5-10 minutes of driving before the warnings go off. I am not sure that is because the tires heat up after 5-10 minutes (although that could be part of it), I just think it takes time for the system to reset.

 

[MartinC]

I have heard that nitrogen is less prone to slow leaks than air because the nitrogen molecules are larger than O2. This does not apply to actual holes in a tire, but only leakages through the rim edges, etc.

But let us not forget air is 80% Nitrogen.
My view is this 'feature' is just another dealer profit generator.

 

[blasterguam]

Hmm. Maybe I am wrong, but I thought that Boyles Law (the volume of a gas is proportional to its temperature) applies pretty much to all gases.

I have heard that nitrogen is less prone to slow leaks than air because the nitrogen molecules are larger than O2. This does not apply to actual holes in a tire, but only leakages through the rim edges, etc.

Actually I think you are thinking of Charles law, but nonetheless you are right, nitrogen provides for the largest molecules in the atmosphere, certainly larger than hydrogen, oxygen, and argon. If it was easy & convenient, I'd run nitrogen too, as it makes sense, but when it's inconvenient and unreasonably expensive it no longer makes sense. Instead of making it cheap they have chosen to market it, and charge the prices of, gaseous gold. Nitrogen is actually cheap and the easiest gas to bottle. (The last lab I ran had a nitrogen generator on-site.) Air works just fine for me, thank you, as nitrogen is just too much trouble and costs too much for what you are getting.

 

[ctrcbob]

But let us not forget air is 80% Nitrogen.
My view is this 'feature' is just another dealer profit generator.

Mandated by the all knowing feds. In all my years of driving, I never had problems with low tire pressures, because I used to check my pressures. Now because some people never checked their pressures, the feds say we have to have this TPMS. (I admit though that in the back of my mind, I know this is TPMS in in my car, I no longer check the tire pressures often, like I used to in the pre-TPMS days).

 

[Mark_888]

But let us not forget air is 80% Nitrogen.
My view is this 'feature' is just another dealer profit generator.

I have never used nitrogen in tires (at least that I know of), but it is not just a gimmick (although I would probably not pay extra for it). Some tire dealers provide nitrogen for no extra charge. The 20% of O2 in air does leak out a little bit faster than 100% nitrogen, which is why airlplanes use it on their tires.

 

[MartinC]

The 20% of O2 in air does leak out a little bit faster than 100% nitrogen, which is why airplanes use it on their tires.

Not so. Here's a quote from 'getnitrogen.org' who must have developed more reasons for use than I've had hot dinners:

"Commercial Airlines – The Federal Aviation Administration (FAA) requires nitrogen in all commercial aircraft tires to eliminate the potential for water vapor (inherent in normal compressed air) from freezing at high altitudes."

No mention of leakage.

I have an air compressor at home but very rarely have I had to top up auto tires.

Now the mower, that's a different story!