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· Registered User
2021 ID.4 Pro, Glacier White
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1,531 Posts
Discussion Starter · #1 ·
I didn't have one, but I do now! It's very handy for when our TPMS 'system' lies to you!
When I started the car in the parking garage this afternoon, I got a tire pressure warning - "Right Rear Tire Low on Air". Didn't have any warning prior when I parked there, so I'm thinking how the heck did it figure out I have a low tire when the car isn't moving?? Parked in a place with better light and got our the tire inflator compressor. If you haven't already switched your 12 volt outlet to be hot at all times, you'll be kicking yourself shortly. The gauge on the compressor showed the right rear had 40+ PSI and I keep my tires at 45, so I thought again, low by less than 5 psi and I get a warning?

I had quite a ways to go on the freeway, so I inflated the tire to about 50 (hard to tell exactly with the gauge on the compressor) thinking if it really is losing air, maybe that'll get me home and I was on my way. Inflating a tire with the outlet only hot when the car is running is a hoot! Started the car and nothing happened. Got out and made sure the switch on the compressor was on and sat in the seat and started the car again and the compressor started working. Got out to check the pressure and it shut off of course, got back in, started the car again for a little more air. I'll be switching that fuse over to 'always hot' first thing in the morning! :p

Drove about 15 miles on the freeway and the warning came on again - Right rear tire low. Pulled off the freeway and put in a little more air and drove home on back roads at a lower speed - Don't wanna ruin a $300 tire

Got home and checked the tire with a good gauge - 54 psi. I don't think the tire was ever low and if I'd had a gauge with me, I could have ignored the warning and just driven home with the warning light on the dash . . . . and saved at least half an hour of wasted time and effort. This European 'no sensor' TPMS system isn't all it's cracked up to be. I'll set all four at exactly 45 psi again in the morning and hope the warning light goes out

Don
 

· Registered User
2021 Moonstone Gray Pro S RWD
Joined
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221 Posts
I didn't have one, but I do now! It's very handy for when our TPMS 'system' lies to you!
When I started the car in the parking garage this afternoon, I got a tire pressure warning - "Right Rear Tire Low on Air". Didn't have any warning prior when I parked there, so I'm thinking how the heck did it figure out I have a low tire when the car isn't moving?? Parked in a place with better light and got our the tire inflator compressor. If you haven't already switched your 12 volt outlet to be hot at all times, you'll be kicking yourself shortly. The gauge on the compressor showed the right rear had 40+ PSI and I keep my tires at 45, so I thought again, low by less than 5 psi and I get a warning?

I had quite a ways to go on the freeway, so I inflated the tire to about 50 (hard to tell exactly with the gauge on the compressor) thinking if it really is losing air, maybe that'll get me home and I was on my way. Inflating a tire with the outlet only hot when the car is running is a hoot! Started the car and nothing happened. Got out and made sure the switch on the compressor was on and sat in the seat and started the car again and the compressor started working. Got out to check the pressure and it shut off of course, got back in, started the car again for a little more air. I'll be switching that fuse over to 'always hot' first thing in the morning! :p

Drove about 15 miles on the freeway and the warning came on again - Right rear tire low. Pulled off the freeway and put in a little more air and drove home on back roads at a lower speed - Don't wanna ruin a $300 tire

Got home and checked the tire with a good gauge - 54 psi. I don't think the tire was ever low and if I'd had a gauge with me, I could have ignored the warning and just driven home with the warning light on the dash . . . . and saved at least half an hour of wasted time and effort. This European 'no sensor' TPMS system isn't all it's cracked up to be. I'll set all four at exactly 45 psi again in the morning and hope the warning light goes out

Don
Are you re-sychronising the tire pressure sensor after you put air in each tire?

It works differently from TPMS systems.
The rolling circumference can change:
— If the tyre pressure has been changed.
— If the tyre pressure is too low.
— If the tyre has structural damage.
— If the vehicle is loaded more heavily on one side.
— If snow chains have been fitted.
— If a temporary spare wheel has been fitted.
— If one wheel per axle has been changed.
 

· Registered User
21 ProS Red - 23 ProS Plus Arctic Blue locked
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559 Posts
I’ve had the sensor go off twice on me, once while climbing the Grapevine on I5 into L.A. I didn’t get an indication of which tire was low. All tires were properly inflated.
 

· Registered User
2021 ID.4 Pro, Glacier White
Joined
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1,531 Posts
Discussion Starter · #8 ·
Are you re-sychronising the tire pressure sensor after you put air in each tire?
Yes, I am. I did that on day one when I first got the car and one other time since. I rechecked all 4 last night (again) and reset the sensor - Had to do that to make the warning light go out . . . . even though all 4 had exactly the same pressure, the warning once triggered doesn't go away until you reset the system

Edit: - This isn't to say you should reset the system just to make the light go out. Don't do it unless you have actually measured the pressure in all 4 and inflated them to equal pressure. If you did have a low tire and reset the system, the car would then think all 4 are properly inflated, even though one was low and you could destroy a tire

Don
 

· Registered User
Joined
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263 Posts
Hi all, this is am interesting thread. In the past, I have always just had my winter/all season tires mounted when season changes. This is an extremely newbie question, but does the ID.4 actually have TPMS sensors in the wheels, or is the pressure ”measurement“ entirely based on rotations/distance? I am asking since I am wondering if I should get a set of winter tires mounted on a separate set of rims potentially with tpms sensors instead of what we are doing currently. When looking at tirerac, it does not suggest to add sensors.
 

· Registered User
2021 VW ID.4 FE
Joined
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381 Posts
Hi all, this is am interesting thread. In the past, I have always just had my winter/all season tires mounted when season changes. This is an extremely newbie question, but does the ID.4 actually have TPMS sensors in the wheels, or is the pressure ”measurement“ entirely based on rotations/distance? I am asking since I am wondering if I should get a set of winter tires mounted on a separate set of rims potentially with tpms sensors instead of what we are doing currently. When looking at tirerac, it does not suggest to add sensors.
No sensors
 
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