Tire Pressure Monitoring System (TPMS) light is on but I have nitrous in my tires - Audi Q3 Forum
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post #1 of 19 Old 02-21-2016, 05:10 PM Thread Starter
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Unhappy Tire Pressure Monitoring System (TPMS) light is on but I have nitrous in my tires

Drove my car today and the tire pressure monitoring system (TPMS) light came on. I haven't checked tire pressure yet but I thought since I have nitrous in my tires that the pressure wouldn't vary. Anyone have any suggestions?

2015 Q3 Prestige Edition w/ Quattro | Monsoon Gray | 19" Tires | Sport Package

Last edited by dipaola; 02-21-2016 at 05:11 PM. Reason: Spelling error
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post #2 of 19 Old 02-21-2016, 07:03 PM
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The nitrous in the tires shouldnt matter. The q3 doesn't have TPMS sensors in the tires. The ABS computer is looking for a change in rotational velocity to determine pressure loss.

I would check and adjust your pressure to what you believe is true and then reset the system through the MMI and monitor it just to make sure you don't have a small leak in one tire.
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post #3 of 19 Old 02-22-2016, 10:56 AM
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NOBODY has has nitrous in their tires - you may have NITROGEN, but that is an entirely different gas. And, while nitrogen pressured tires DO vary less than simple air, by virtue of molecular diffusivity, they are STILL subject to seasonal temperature/pressure differences that are usually triggered in any TPMS. Greater still, they are just as susceptible to every kind of hazard that can lead to a leak ...

Oh, and while ralfo is correct about TPMS sensors in the tires, the Q3 still has a TPMS, which works via the ABS sensors and measures differences in tire pressures. TPMS stands for Tire Pressure Monitoring System, and has NOTHING to do with exactly what method or sensors are used to do the monitoring of tire pressures ... just that is does it.


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post #4 of 19 Old 02-22-2016, 08:43 PM Thread Starter
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OMG sorry guys, I meant to type Nitrogen. I would edit the post but it won't let me.

I have been monitoring the tires visually and the tires look fine.

I'll check one more time in the morning and then I'll reset the TPMS.

Is it necessary for me to do a physical check with a gauge?

Thanks for the help.

2015 Q3 Prestige Edition w/ Quattro | Monsoon Gray | 19" Tires | Sport Package
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post #5 of 19 Old 02-23-2016, 07:04 AM
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OMG sorry guys, I meant to type Nitrogen. I would edit the post but it won't let me.

I have been monitoring the tires visually and the tires look fine.

I'll check one more time in the morning and then I'll reset the TPMS.

Is it necessary for me to do a physical check with a gauge?

Thanks for the help.
Do not do a visual check as you can easily have 5 PSI difference and not be able to see it (try it and see). Everyone should have a good tire gauge and check their tires monthly...
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post #6 of 19 Old 02-23-2016, 05:35 PM
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Do not do a visual check as you can easily have 5 PSI difference and not be able to see it (try it and see). Everyone should have a good tire gauge and check their tires monthly...
The scary part is, when you reach single digits, that when it looks noticeable and that's when its dangerous.
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post #7 of 19 Old 02-23-2016, 06:40 PM Thread Starter
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I bought a pressure gauge today. Tested all 4 tires and they all were reading 35 PSI

Although the sticker inside the door says that the front tires should be 40 and the rears should be 44.

Now what?

2015 Q3 Prestige Edition w/ Quattro | Monsoon Gray | 19" Tires | Sport Package
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post #8 of 19 Old 02-23-2016, 07:39 PM
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The sticker should give you two pressure options higher for full load, lower for three passengers or less. (I set mine at the lower for more comfort) you can set yours as per your liking and reset you tpms via the mmi and you should be good. Note if you don't want to add nitrogen or mix with air, and are comfortable with the ride at 35psi just reset in mmi and you should be fine.
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post #9 of 19 Old 02-24-2016, 08:03 AM Thread Starter
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Thanks for the update. I like the ride comfort at 35PSI, just didn't know I could drive at that PSI, since the sticker showed 40 and 45.

2015 Q3 Prestige Edition w/ Quattro | Monsoon Gray | 19" Tires | Sport Package
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post #10 of 19 Old 02-24-2016, 06:57 PM
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What are the downsides to mixing nitrogen with air?
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