Porsche 718 Forum banner

1 - 20 of 29 Posts

·
Registered
Joined
·
12 Posts
Discussion Starter #1
Last weekend my front driver side wheel keeps alarming -4 or -6 psi pressure loss upon starting the car and driving off. After a few moments the sensor will read the correct pressure and turn off. I checked the tire and did not find any damage and my manual pressure gauge matched pressure reading from sensor after alarming goes away. This happened 4 times in a day. Anyone else have this type of issue and how did you resolve it?
 

·
Registered
Joined
·
720 Posts
Did you check your cold tire pressures? You may have one slightly low tire. After driving a short bit, the tire flexing will tend to heat the tire and raise tire pressure (perhaps enough to shut off the sensor). Just a thought.

Otherwise, it could be a weak battery in the tire valve sensor. Easy for the dealer to fix.
 

·
Registered
Joined
·
6 Posts
Last weekend my front driver side wheel keeps alarming -4 or -6 psi pressure loss upon starting the car and driving off. After a few moments the sensor will read the correct pressure and turn off. I checked the tire and did not find any damage and my manual pressure gauge matched pressure reading from sensor after alarming goes away. This happened 4 times in a day. Anyone else have this type of issue and how did you resolve it?
 

·
Premium Member
Joined
·
2,455 Posts
Have a 2019 and just had the exact tire pressure problem. Did you ever find the cause?
This may not be your issue but I found when I had my 3RS I changed the OEM tire valve caps to a decorative set and I started getting all aberrant false low readings. When I changed the value caps back to the OEM caps the problem was solved. Apparently, the OEM valve caps are an antenna that are important for accurate pressure readings.

 

·
Registered
Joined
·
2,032 Posts
I don't know whether my experience is worth anything in this issue, but I have 2 decorative (plastic) caps and 2 generic plastic caps. The original (metal?) caps were misplaced (!...) during tire changes...

The system reports fine.

I find it takes a few seconds driving over 15 mph from a cold start before the TPMS starts reporting, but this is to be expected.
 

·
Registered
Joined
·
646 Posts
I just put a set of decorative Porsche logo metal caps on my BS this Saturday. Zero aberrant TPMS behavior over the past three days (~150 miles).
 

·
Registered
Joined
·
646 Posts
Not sure if our plastic caps were OE, but that would be my guess since it was a CPO (20" Carrera S Wheels) with only 1,082 miles at delivery.
 

·
Registered
Joined
·
6 Posts
I have read most of the replies and having had the same problem. On my 2019 Cayman I have the aftermarket valve stem covers and thought that may be the problem bu instead I released 5 lbs of pressure and refilled the tires and the problem went away. I this is my 7th porsche and have been driving them since 1970. I also own a Carrera Cabrolet. I think by excercizing the sensor it solves the problem. You may want to try this before the dealer. Worked for me.
 

·
Registered
Joined
·
799 Posts
A few days ago I started the car and got an alert that one tire was 4psi low which included the idiot light indicator. I toggled the bottom right stalk and found it reading all tires properly inflated. I checked with a manual guage and all were at proper psi. No warnings since. Give it some time and the gremlins will work their way out of the system.
 

·
Registered
Joined
·
1,319 Posts
On my 2019 Cayman I have the aftermarket valve stem covers and thought that may be the problem bu instead I released 5 lbs of pressure and refilled the tires and the problem went away. ... I think by excercizing the sensor it solves the problem.
Or equally likely, you re-seated the valve seals when you released air and refilled them.
 

·
Registered
Joined
·
316 Posts
Another suggestion is to check to ensure the valve stem core is tight. A loose valve stem core will allow air to leak out at a slow rate. You’ll need a valve stem tool to do that.
 

·
Registered
Joined
·
2,032 Posts
Another suggestion is to check to ensure the valve stem core is tight. A loose valve stem core will allow air to leak out at a slow rate. You’ll need a valve stem tool to do that.
Doesn't it come with the tire repair kit? (The valve stem tool...).
 

·
Registered
Joined
·
77 Posts
Same problem, cold winter pressure alarm but in the screen al tires are ok ? Alarm gives 0,3 bar less , on display al fine , i pumped the tires up and let go a bit , on screen is correct , now its Gone again, see pictures of alarm and pressure is ok
30216
6A9888C7-BD31-4DAD-B0B2-33079D350584.jpeg
 
1 - 20 of 29 Posts
Top