To add to the other issues that have been happening with my car recently, I now have issues with one of my TPMS on one of my wheels.

Today when I turned the car on, the dash indicator came on telling me to check the tire pressure on my driver front wheel. I am running aftermarket wheels, but have OEM TPMS' on each of the wheels.

When the car first turned on, the driver front tire was reading at 27 PSI. I'm not sure what pressure triggers the warning, but the other 3 were reading at 28. After I began driving, the pressure got up to 30 PSI on all 4 tires. I turned the car off and back on again and the pressure still read at 30 PSI on the front right tire, but the warning still pops up on the dash.

When I first had my tires mounted, the sensors were telling me I had 36 PSI in all 4 tires. Not sure why they are dropping as much as they have in the ~6 months I have had them on the car, but I will check the pressure with the tool I keep in my car after work.

Any ideas on what may be happening with my sensor? If 27 PSI triggered it, I figure the issue would have gone away when I turned the car back on and it read 30 PSI. This may be more science related, but why are the pressure in my tires increasing as I drive the car?

Along with the other issues this car has, I'm about 1 more problem away from selling this POS.

 

That's pretty low.. COLD PSI for Type S should be 35 front and 32 rear. Check your door jamb for confirmation

 

Assuming your TPMS system is giving you accurate readings, why are you running your tires at such low PSI to begin with?? In order to correctly assess if you have are truly having issues with your TPMS system, you need to set your tires to a cold (as in sitting overnight) PSI setting of 32 and go from there. All you are doing by driving around on under inflated tires is killing your gas mileage and wearing out your tires faster...............

 

I agree the pressure is low. When I had the tires mounted, all 4 were filled to 36 PSI. Last time I checked the TPMS readings, everything looked good.

I am going to run by Discount Tire today after work and see if they can reset the sensor and check for issues. They mentioned they may need to calibrate them when the wheels and tires got mounted, but I never had that done and everything has seemed fine for ~6 months or so. It does seem strange that all 4 tires would lose 6 PSI over a short period of time. Ever stranger is why only one of the tires triggered the error.

Unless someone is messing with my car (doubtful), I am hoping a calibration and fill of tires will fix the issue. Otherwise, I guess I'm looking at another $70 I gotta spend and I'll just add it to the growing list. This is honestly the least concerning issue right now. My passenger Raxle is fucked and my steering has some dead play where you can juggle the wheel and the tires move slightly. One more issue away from selling.

 

If they are OEM TPMS sensors - there is no calibration needed. Lots of things can lead to air loss, but based on what you have laid out they have lost about 1 PSI per month and something you should have probably noticed earlier. I don't know all the other issues you are having but as you pointed out this is relatively minor so far.

 

Agreed

could be a bad tire bead, could be a valve core not tightened down properly, could also be drastic temperature changes. make sure to fill 32/35 PSI COLD!

 

The temperature this morning was colder than pretty much every other morning this summer, which I'm sure is part of the issue.

Worst case is I throw my OEM wheels back on for awhile, again.

I'll double check with my tool in my car, but I'll still run by Discount Tire and ask some questions. If it's the tire(s) that's/that are bad, then I spent the extra money on the free replacement warranty, so I would hope they would honor it.

 

I know you're frustrated with the rest of your car's issues but i think this issue is easily remedied and the root cause has been identified

 

Tire PSI drop approx 1 PSI for every 10 degrees in ambient temperature change.

 

Thanks man! If I can get a replacement axle from Raxles, it should fix a majority of the driveablity issues. The steering is a little different, but I am hoping it's just a worn out component. If it's the rack, well, I'm screwed.

Interesting and good to know, thanks!