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Old 10-30-2012, 03:15 PM   #1
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2013 TPMS sensors

Does the 2013 Rubicon have a TPMS sensor in the spare tire or just the 4?

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Old 10-30-2012, 03:25 PM   #2
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Should be in all five or you'd have problems with the TPMS when you do a five tire rotation. I know the 2012s have them in all five.

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Old 10-30-2012, 03:45 PM   #3
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All five including the spare, it's a different part number from 2012-older
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Old 10-30-2012, 07:05 PM   #4
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Ok. Thanks.
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Old 10-30-2012, 08:41 PM   #5
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I specifically asked when I purchased my 2013 Unlimited Rubicon a week ago. I was told there is a TPMS in the spare as well.

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Old 10-31-2012, 09:36 AM   #6
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Of course there is one in the full size spare. If not, the TPMS would go crazy. Also, it can set off the TPMS on the dash. If all of your tires are filled and you are getting the warning. Make sure your spare is filled as well.
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Old 10-31-2012, 12:13 PM   #7
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The reason I ask is the dash only appears to show tire pressures for the four wheels on the 2013 evic display.
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Old 10-31-2012, 03:02 PM   #8
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Quote:
Originally Posted by Samuno View Post
The reason I ask is the dash only appears to show tire pressures for the four wheels on the 2013 evic display.
Why would it show the spare!? The system shows the tire pressure for your safety while driving on those 4 tires. If one of those tires fails, you move the spare to that spot and the system will pick display it.
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Old 10-31-2012, 03:48 PM   #9
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My 13 sport desn't have the TPMS option but the sensors are there so I'm pretty sure all 17" wheels have the sensors installed
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Old 10-31-2012, 03:59 PM   #10
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I don't have full access to pull the requirement but a few years back it becam a federal requirement that all us vehicles must now be equipped with TPMS monitoring. So everyone should have it.

And it does monitor the spare at all times. You can search the threads and many people have had TPMs lights on and after hours of trouble shooting with no luck have finally found that it was the spare tire that was low. The TPMS only monitors a sensor freq. it does not know which tire is low or how many tires there actually are.
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Old 10-31-2012, 05:47 PM   #11
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Originally Posted by Darkfire View Post
I don't have full access to pull the requirement but a few years back it becam a federal requirement that all us vehicles must now be equipped with TPMS monitoring. So everyone should have it.

And it does monitor the spare at all times. You can search the threads and many people have had TPMs lights on and after hours of trouble shooting with no luck have finally found that it was the spare tire that was low. The TPMS only monitors a sensor freq. it does not know which tire is low or how many tires there actually are.
While the is a TPMS sensor in the spare the system doesn't monitor the spare. Sensors are activated by inertial control and the spare doesn't spin. The system sees 4 uniqiue id'd active sensors reporting a pressure.
Let the air out of your spare and see what (doesn't) happen.

Most of those people that reported dash lights simply inflated past the threshold turning them off. A cheap tire gauge that reports on the high side will cause this problem.
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Old 01-18-2013, 10:17 AM   #12
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Sorry for bumping an old thread but I was curious about this as well. I just sold my original set of tires off a 2013 JKU last night, and while I had transferred the sensors to my 4 new wheels and tires when I had them changed (I only bought 4 new wheels and tires and kept one of the originals for a spare), I totally forgot about the one that was still in the original spare.

So I sold my spare along with the original set of 4 last night but no lights have lit up on the dash yet.

So I am assuming this must be true, as long as the wheel is not in motion then it is not being monitored by the computer, unless my dash light is suddenly going to come on today.
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Old 01-18-2013, 10:54 AM   #13
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Originally Posted by jeffbab View Post
Sorry for bumping an old thread but I was curious about this as well. I just sold my original set of tires off a 2013 JKU last night, and while I had transferred the sensors to my 4 new wheels and tires when I had them changed (I only bought 4 new wheels and tires and kept one of the originals for a spare), I totally forgot about the one that was still in the original spare.

So I sold my spare along with the original set of 4 last night but no lights have lit up on the dash yet.

So I am assuming this must be true, as long as the wheel is not in motion then it is not being monitored by the computer, unless my dash light is suddenly going to come on today.
No worry, your light won't come on because of the spare. Get a sharpie and write "No TPMS - 01/17/13" on the inside of the spare's rim, so a few years from now when you use it you'll know why the dash light comes on.

There's a guy on ebay selling 2013 TPMS sensors, for $44/set. I've bought and installed a few sets
4 New Chrysler Dodge Jeep TPMS 56029398AB 433MHz Tire Pressure Sensors | eBay
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Old 01-18-2013, 04:01 PM   #14
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^ What JKs1H1 said. I have been rolling without my spare mounted for a few weeks now, while I wait for my tire carrier bumper. I have yet to set off a TPMS error. But on my wife's Range Rover, if the spare, which is mounted under the back of the vehicle, is low, it will set off the TPMS sensor. So I guess it depends on the vehicle....
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Old 01-18-2013, 06:36 PM   #15
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Quote:
Originally Posted by Ex Umbris Currus View Post
Should be in all five or you'd have problems with the TPMS when you do a five tire rotation. I know the 2012s have them in all five.
The Spare isn't part of a Tire Rotation, for one, that's why it's called a spare, to be ready when needed, not worn out/down. Per the owners manual, it shows you how to rotate and the spare will not set off the tire warnings.... A spare is to be used as a spare, not as a permanent solution.

from manual:

A tire pressure monitoring sensor is located in the spare
wheel if the vehicle is equipped with a matching full size
spare wheel and tire assembly. The matching full size
spare tire can be used in place of any of the four road
tires. A low spare tire will not cause the “Tire Pressure
Monitoring Telltale Light” to illuminate or the chime to
sound.
The Tire Pressure Monitor System (TPMS) consists of the
following components:
• Receiver Module
• Four Tire Pressure Monitoring Sensors
• Tire Pressure Monitoring Telltale Light...

TIRE ROTATION RECOMMENDATIONS
The tires on the front and rear of your vehicle operate at
different loads and perform different steering, handling,
and braking functions. For these reasons, they wear at
unequal rates.
These effects can be reduced by timely rotation of tires.
The benefits of rotation are especially worthwhile with
aggressive tread designs such as those on On/Off Road
type tires. Rotation will increase tread life, help to maintain
mud, snow, and wet traction levels, and contribute to
a smooth, quiet ride.
Refer to the “Maintenance Schedule” for the proper maintenance
intervals. The reasons for any rapid or unusual
wear should be corrected prior to rotation being performed.
The suggested rotation method is the “forward-cross”
shown in the following diagram.

Click image for larger version

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Old 01-18-2013, 06:39 PM   #16
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Originally Posted by 3JKs1H1 View Post
While the is a TPMS sensor in the spare the system doesn't monitor the spare. Sensors are activated by inertial control and the spare doesn't spin. The system sees 4 uniqiue id'd active sensors reporting a pressure.
Let the air out of your spare and see what (doesn't) happen.

Most of those people that reported dash lights simply inflated past the threshold turning them off. A cheap tire gauge that reports on the high side will cause this problem.
You are Right....Here is that info from the 2013 Owners manual:

A tire pressure monitoring sensor is located in the spare
wheel if the vehicle is equipped with a matching full size
spare wheel and tire assembly. The matching full size
spare tire can be used in place of any of the four road
tires. A low spare tire will not cause the “Tire Pressure
Monitoring Telltale Light” to illuminate or the chime to
sound.
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Old 01-18-2013, 06:46 PM   #17
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I don't have full access to pull the requirement but a few years back it becam a federal requirement that all us vehicles must now be equipped with TPMS monitoring. So everyone should have it.

And it does monitor the spare at all times. You can search the threads and many people have had TPMs lights on and after hours of trouble shooting with no luck have finally found that it was the spare tire that was low. The TPMS only monitors a sensor freq. it does not know which tire is low or how many tires there actually are.
REad your Manual.....plus thst's the only way these devices can work.....if they were on 24/7 they would have to be changed very often....the Battery can't be that big and last that long....so how else could that work?
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Old 01-18-2013, 06:47 PM   #18
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How a Tire Pressure Monitoring System Works

As its name suggests, a tire pressure monitoring system is more than a single part. In fact, TPMS involves a valve and a sensor, and it's also important to know that not all TPMS systems are created equal.There are two kinds of TPMS technology–indirect and direct. Indirect TPMS approximates tire pressure indirectly by using data from the vehicle's antilock brake system (ABS). Direct TPMS provides a more accurate calculation of your tire pressure using data gathered directly from a sensor placed inside each tire.
In either case, if a tire is detected to be underinflated by 25% or more, an alert lights up on your dashboard. But with direct TPMS, drivers are alerted sooner and–if the car is equipped with the four-tire TPMS display–can even see readings for each tire. One of the largest downsides of an indirect TPMS system is that it cannot detect when all four tires are low in pressure, which can happen quite frequently if tire pressure is not checked on a regular basis.
To get a better understanding of how TPMS works and how it helps make driving safer, watch this video on TPMS technology.
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Old 01-18-2013, 06:56 PM   #19
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DIRECT & INDIRECT TIRE PRESSURE MONITORS
There are essentially two basic ways to monitor tire pressure electronically. One is the direct method. A small pressure sensor is located inside each wheel. The sensor has a built-in transponder that broadcasts a radio signal to an external module. The module identifies the signal from each wheel and keeps an eye on pressure. If pressure drops below a predetermined threshold, the module turns on a light or displays a message to warn the driver.


he pressure sensors may be mounted in the drop center inside the wheel, or on the end of the valve stem inside the wheel. Stem mounted pressure sensors use the valve stem as the antenna, so don't replace the standard valve caps with anything else. Sensors attached to the rim drop center are typically held in place by a long steel strap that wraps all the way around the wheel. The pressure sensors are very accurate (usually within 2 lbs. or less).

The other method of monitoring tire pressure does not require any additional hardware inside or outside the wheel. It is the "indirect" method. This approach makes use of the existing wheel speed sensors in the antilock brake (ABS) system. By modifying the ABS operating software, the ABS system learns the average speed at which each wheel rotates when traveling straight at a constant velocity, and detects low tires by comparing relative wheel speeds. The auto makers like this approach because it is a simple, cost-effective way to monitor tire pressure. But it has some limitations.

On most North American indirect TPMS systems (1999 to 2003 model year applications), the systems cannot detect a low tire if two tires on the same axle are low, or if all four tires are low by an equal amount. But it can detect one or more low tire if the rest are at or near the recommended inflation pressure. Some of the newest European indirect TPMS systems can detect air loss in any combination of tires, as well as a gradual loss of air pressure during cold weather in all four tires.

Here's how the indirect ABS-based TPMS works. If a tire loses air, the diameter of the tire shrinks slightly causing it to turn at a slightly faster rate than the others. But on most applications, a tire has to loose anywhere from 8 to 14 pounds of air pressure before there's enough of a difference in diameter to be detected by the wheel speed sensors. It depends on the type of tires, tire diameter and aspect ratio, and the sensitivity of the ABS system.

Low profile tires with short stiff sidewalls change diameter less than tires with taller aspect ratios and more compliant sidewalls. Consequently, a loss of 10 psi in a low profile tire may only change the diameter of the tire less than 1 mm (0.040 inches). Most ABS systems cannot detect changes smaller than 1 mm. For this reason, indirect ABS-based tire pressure monitoring systems are not as sensitive as direct TPMS systems that have a pressure sensor inside each wheel
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Old 01-18-2013, 07:57 PM   #20
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The Spare isn't part of a Tire Rotation, for one, that's why it's called a spare, to be ready when needed, not worn out/down. Per the owners manual, it shows you how to rotate and the spare will not set off the tire warnings.... A spare is to be used as a spare, not as a permanent solution.
A spare on every JKU I have seen is the exact same wheel, tire, and TPMS sensor that's on every corner of your wrangler. As such, it's somewhat of a waste not to rotate it into the mix. (Rubber doesn't last forever). Not to be nit-picky, but if it's rotated in, it tends to be around the same outside diameter when they wear down (so your not putting on a slightly larger spare if the other tires are worn - works the diff more -ok-pretty nit-picky, but accurate nonetheless). Also, a new spare almost says "take me", so I always toss a more worn tire on there.
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Old 01-18-2013, 08:32 PM   #21
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A spare on every JKU I have seen is the exact same wheel, tire, and TPMS sensor that's on every corner of your wrangler. As such, it's somewhat of a waste not to rotate it into the mix. (Rubber doesn't last forever). Not to be nit-picky, but if it's rotated in, it tends to be around the same outside diameter when they wear down (so your not putting on a slightly larger spare if the other tires are worn - works the diff more -ok-pretty nit-picky, but accurate nonetheless). Also, a new spare almost says "take me", so I always toss a more worn tire on there.
Think about this: How many other vehicles use their Spare tire as part of a Rotation. So it will wear even, not rot??? Compare a Wrangler's Spare to other Vehicle's spare and I bet ours will last 10 times as long, even if used a few times as a Temp Spare. But putting your Back up Spare in Use that isn't Needed is Risking it being able to do it's Job and what it is waiting to do.....lol
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Old 01-18-2013, 08:47 PM   #22
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Think about this: How many other vehicles use their Spare tire as part of a Rotation. So it will wear even, not rot??? Compare a Wrangler's Spare to other Vehicle's spare and I bet ours will last 10 times as long, even if used a few times as a Temp Spare. But putting your Back up Spare in Use that isn't Needed is Risking it being able to do it's Job and what it is waiting to do.....lol
Respectfully Sircody, you are uninformed. Many, if not most other cars do not have a spare that is identical to the other four tires. The wrangler (and I own 5) use the exact same tires, wheels, and tpms on the spare as they do on the rest of the vehicle. I know this because I have personally mounted and balanced four sets of Duratracs on factory and after market alloys. I've also mounted KM2s plus bridgestones for summer driving.

Since a tire lasts 40K miles, why not have 20K on the spare? It "proves" that there aren't any manufacturing defects. - since you've put 20K miles on it.

Again, not trying to be a D***, but when you have 5 or 6 sets of spares in the garage and rotate often, you figure it out pretty quickly.
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Old 01-18-2013, 08:58 PM   #23
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Why would it show the spare!? The system shows the tire pressure for your safety while driving on those 4 tires. If one of those tires fails, you move the spare to that spot and the system will pick display it.
Because if the spare was flat you wouldn't know it. My wife's Lexus and my 370z monitor the spare.
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Old 01-19-2013, 12:36 AM   #24
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Respectfully Sircody, you are uninformed. Many, if not most other cars do not have a spare that is identical to the other four tires. The wrangler (and I own 5) use the exact same tires, wheels, and tpms on the spare as they do on the rest of the vehicle. I know this because I have personally mounted and balanced four sets of Duratracs on factory and after market alloys. I've also mounted KM2s plus bridgestones for summer driving.

Since a tire lasts 40K miles, why not have 20K on the spare? It "proves" that there aren't any manufacturing defects. - since you've put 20K miles on it.

Again, not trying to be a D***, but when you have 5 or 6 sets of spares in the garage and rotate often, you figure it out pretty quickly.

That was my point.....Since 99 percent of vehicles have a small compact spare, they don't use it in a Tire Rotation. So that would mean the Norm of Rotation of tires would not include the Spare being part of it.......
So by including the spare in rotation, when time to purchace Tires, instead of the cost of 4, you have 5 to purchase.
]
And by using the spare in rotation, how many miles does it add to the time stretch between tire purchases? So on top of a Tire bill being higher at purchase time (5 tires) those tires are alot more expensive then the normal driver that needs to purchase only 4 and those 4 at a lower cost.....

So by leaving that spare to be a spare and replace only when needed wouldn't total up to a bigger savings????

So a Defect has a rule to show up before a certain milage is the rule?

And not sure why I'm to blame that Chrysler isn't puting the higher dollar TPMS system on the jeep so it monitors the spare, but it's posted in all Manuals from 2007-2013,,,I didn't write it. But I would like to see a monitoring system and how they decided to design the icon to show for the spare....that's a thinking about what kind of a design.....like a car icon with the tire on the trunk like the old Lincoln Mark series, or the Old Caddy Seville....lol...
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Old 01-19-2013, 01:14 AM   #25
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With 5 tires in Rotation, it makes it easier for us (I'll do it later) guys to put off getting a new tire to replace bad one, and/or if one of the 5 does go, you end up with a 5th tire bigger then the other four.....if I leave my Spare as a Spare and have blow out, i def would fix the problem faster, esp with the bigger spare on it now causing problems.....It forces you to do what u need to do, as if they are all the same size, minus a spare no longer, you're likely to risk driving longer and putting off getting the new tire for a spare and you won't have one when you need it.....

So per the Tire Manufactures, Tire is good for 6 years, so that can be around 12 or so tires that I don't purchase and the 5 tire Rotaters will spend $3000.00 or more then 4 tire rotaters...of course if no problems popped up....

Understanding Tire Warranties

5 Things That Will Void Your Coverage

Tire Life
Most tiremakers have determined that the usable life of a tire is either six years from the date of purchase or when there's just 2/32nds of an inch of tread left. While there's no federal law regulating tire wear, Ron Margadonna, senior technical marketing manager for Michelin Tires, says that the 2/32nds measurement has been adopted by most states.
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Old 01-19-2013, 03:18 AM   #26
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I rotate all five of my tires and will continue to do so.

Quote:
Originally Posted by MTH View Post
Here's some reading:

http://www.wranglerforum.com/f33/1st...on-138621.html

http://www.wranglerforum.com/f33/5-t...ion-65743.html

http://www.wranglerforum.com/f33/rot...es-109698.html

http://www.wranglerforum.com/f33/spa...on-105912.html

http://www.wranglerforum.com/f33/5-t...ion-84043.html

http://www.wranglerforum.com/f33/tir...ion-62174.html

http://www.wranglerforum.com/f33/5-t...ion-26424.html

It's a matter of preference, but most folks recommend rotating all five. You get to go longer before needing new tires, and when you do need new tires you can go with a different brand/style/size without being stuck with (or throwing away) an old spare that no longer matches. The lone downside is that you need to buy five tires rather than four when the time comes for new tires, but, again, you'll need new tires less often so it balances out.
My apologies to Samuno for hijacking this thread so back on track.

If you want info on TPMS look up Schrader International TPMS. They make just about all TPMS in vehicles today. When I bounced my tire off a rock and broke my valve stem the dealership wanted over $100 to fix it. I told them to get bent and did my own research. Tire was fixed elsewhere for $12 ($2 for service pack and $10 to get it put in tire and balanced) and the purchase of a ProCal (to get rid of the idiot alarm when I air down). Below is listed the part numbers from Schrader International with the service pack being just the valve stem. The dealership said that they had to replace the whole sensor just because of a broken valve stem. Ignorance is bliss and it's also costly.

2013 Wrangler Part #
Sensor .................................................. 20398
Service Pack ..........................................20018

2012 Wrangler Part #
EZ-sensor - 315 MHz ............................33000
EZ-sensor Service Pack; Almnm. Valve......34000
EZ-sensor Service Pack; Rubber Valve .....20008
Sensor ...............................................200 66 or 28308
Service Pack .......................................20018
http://www.schraderinternational.com..._11-13-12.ashx
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Old 01-19-2013, 08:13 AM   #27
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I rotate all five of my tires and will continue to do so.
Same here. Although this is the first vehicle we've owned with a full size spare I plan on mixing it in with the others. I can't see a reason to let it hang there for years and years and let it dry rot.

I have an air compressor in my basement with a hose routed upstairs to the garage and I do all of my own tire rotations. I got tired of the service departments, etc., tightening the lug nuts down so tight that my 150 ft/lbs scrap torque wrench wouldn't even budge them loose so I bough a compressor. Very easy to remove those lug nuts now.
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Old 01-22-2013, 12:07 PM   #28
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I won't get into some of the poor logic in this thread about why you shouldn't ever use your "spare" in the mix...

But I do have a question. Does anybody know from the FSM the exact threshold of the TPMS sensors? Right now all 5 of my tires are between 32 and 34 psi and my light is on. Sticker on door jamb says 35...but I think a 2-3 psi window is awfully small. Surely they would allow a little more than this before throwing the light.
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Old 01-22-2013, 12:46 PM   #29
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Mine will come on at around 30-31 psi. Same with the 2012 rental we wheeled. (it had a slow leak and the TPMS worked like clockwork) This is on 2010 and 2012 models. Who knows how accurate the gauges are, so they could be a few pounds off. If I air up to 36/37 the always go off.
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Old 01-27-2013, 05:41 PM   #30
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A bit off topic but you seem to know about Wrangler TPMS.

I just bought 5 new 2013 Rubicon wheel/tire takeoffs from a dealer. The are now on my 2009 Grand Cherokee. They fit and work great.

But the TPMS is still dead after driving around for a few days. When I pull in my garage, the old Cherokee wheels piled in my garage all register on my TPMS.

Do you know if the new Rubicon sensors don't work with ealier Jeeps ?

Is there a way for me to tell if the Dealer removed the sensors ? The dealer turned the Rubicon into a Monster truck for the buyer. Maybe the dealer was dumb enough to remove the sensors before selling the wheels to me.

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