Low tire pressure warning - Ford Mustang Forum
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post #1 of 17 (permalink) Old 10-17-2013 Thread Starter
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Low tire pressure warning

Was driving around today & suddenly an alarm sound (Same sound when you insert the key in the ignition). The indicator says " LOW TIRE PRESSURE".

So the warning stays on all the time. It was late mid night & we stop at the road side( Tire seems fine when check visually). We continue on our journey back home. So far so good & the tires seems ok? BTW we never ever check our tire pressure since we got our car over a year ago from the showroom.

I do hope its only a low tire pressure & not some sensors? We will try to bring to the tire shop tomorrow to check the tire pressure.

*Do we need to reset any thing once we top off the tire?


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post #2 of 17 (permalink) Old 10-17-2013
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I had a similar issue like this before. I thought the TPMS sensors were defective. It turned out to be a a nail stuck deep in the groove of the tire. Perhaps try looking for nails in the tires?
I'm surprised you never lost any tire pressure over a year... I lose 1-2 psi every month or two. I always check every month or so.


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post #3 of 17 (permalink) Old 10-17-2013 Thread Starter
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I see. Whenever you lose some psi- Does it triggers the "low tire pressure" warning on the dash? I guess its normal to lose air pressure over time?

I only can bring my car on a Saturday Morning to a tire shop as over here- Friday- most business are close. I wonder if its ok to drive around a bit tomorrow with the "low tire pressure" warning on the dash? My car is nitrogen filled from the factory. Tires looks OK.

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post #4 of 17 (permalink) Old 10-18-2013
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Yes, it is normal to loose air pressure over time. You should get a tire gauge and check it every 2 or 3 months.
Nitrogen does not leak out as fast as normal air.
Since youv'e had the car over a year, even the nitrogen has probably gotten low. Your sensors are "probably" OK.
You don't need to reset anything once the air pressure is up to norma.
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post #5 of 17 (permalink) Old 10-18-2013
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Quote:
Originally Posted by z928 View Post
I see. Whenever you lose some psi- Does it triggers the "low tire pressure" warning on the dash? I guess its normal to lose air pressure over time?

I only can bring my car on a Saturday Morning to a tire shop as over here- Friday- most business are close. I wonder if its ok to drive around a bit tomorrow with the "low tire pressure" warning on the dash? My car is nitrogen filled from the factory. Tires looks OK.
i got the LOW TIRE PRESSURE message last week, turns out i had a screw in my right rear tire and it was leaking air slowly. BTW, don't wait for the warning message, my deflating tire was down to 20 psi when i got the warning from the TPMS. Not knowing what was wrong, i inflated the tire and checked it again a few days later.... down to 24 psi and no warning.

So my guess is that the TPMS warns the driver at around 20psi, wich is way too low already. Tire pressure must be checked regularly for safety

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post #6 of 17 (permalink) Old 10-18-2013
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Quote:
Originally Posted by Fabulozzz View Post
i got the LOW TIRE PRESSURE message last week, turns out i had a screw in my right rear tire and it was leaking air slowly. BTW, don't wait for the warning message, my deflating tire was down to 20 psi when i got the warning from the TPMS. Not knowing what was wrong, i inflated the tire and checked it again a few days later.... down to 24 psi and no warning.

So my guess is that the TPMS warns the driver at around 20psi, wich is way too low already. Tire pressure must be checked regularly for safety
Wow this is an interesting coincidence. Last week I also got my low tire pressure message and I also had a screw in my right rear tire. When the sensor went off the tire was also at 20 psi. I guess that's the threshold level? After re-inflation I had mine go down to 23 psi a few days later and also no warning. The problematic aspect of this is that at 20 psi the tire does not appear to be deflated visually.

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post #7 of 17 (permalink) Old 10-18-2013 Thread Starter
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top it off. At the petrol station shop. The mechanic said One tire has 25 psi, the other have 28psi. The other side both tires have 30psi. Once he top off., the message on the dash is gone

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post #8 of 17 (permalink) Old 10-18-2013
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I hope you have learned something.......

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post #9 of 17 (permalink) Old 10-18-2013
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I hope you have learned something.......
Yep, and that lesson should include buying a small tire pressure gauge and keeping it in your car or house.
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and that is why owning a tire pressure gauge is a good idea

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Yep from my experience you'll lose pressure with dramatic temp changes. Change in seasons going from Summer to the first cold spell. I'll also see it when it goes from Cold to Hot. Just fill the air up with tires make sure you don't have any punctures and your good to go.

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I check my tire pressure about once a month, but in one of our Fords a sensor in one of the wheels went bad & set off the light on the dash. It was replaced under warranty.

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Tires usually lose about 1 psi a month. If it is a low profile tire, it can lose more than that. Also, tires lose about 1 psi for every 10 degree drop in temperature (Fahrenheit). So, in a year, each tire may lose about 12 psi. That's not even taking into account the amount it changes from temperature.

With modern tires it can be very difficult to tell from just looking if a tire is low. Unless it is truly a "flat tire," an underinflated tire will often still look ok.

It's probably a good idea to check tire pressures at least once a month. That way you can add some air if needed. Also, if there is a leak from a nail or something, you will catch it early. Because when a tire is too low in pressure, it heats up a lot when driven on (due to needing to flex a lot more). This makes it prone to blowouts or other failure that requires replacement. If you catch a leak or nail early, it can usually be repaired for a lot cheaper than tire replacement.

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lol in 7 months I only have one tire that leaks..... about 10 lbs. the others are all within 1lb of spec. Haven't found a screw yet. but yeah the low light goes off when the tires are in spec

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Also, check tires that have not been driven (even a mile) for four hours. If you don't have a compressor/pump at your house, check your pressures (ALL FOUR), note the pressures (write them down), drive to the station, recheck the pressures, then you know how much to add at the station.
Check your tires every month. They are the only part of your car contacting the road and the most important safety item. Don't buy re-treads. Don't patch sidewall punctures. Drive safely.

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