Probably innocuous, but when resetting the TPMS for my new wheels, the car only asks whether I have 19” or 21” wheels. No option for any other size (20” in my case). I wonder if the trigger points for the warnings to pop up are hard-coded based on the factory 45psi/42psi for the 19s/21s respectively?
In other cars, when you perform a reset, you’re telling the car that your currently set pressures are now the “right” values so it shouldn’t warn you until they drop by 25% (or whatever) from those settings. That is, if I intentionally want to run much different pressures, I tell the car that by performing a reset.
After leaving the tire shop last night with my new setup, the car instantly recognized the new TPMS and wanted me to reset, which I did. The shop had set the pressures to 42 front and only 36 rear. Driving this morning, I got a warning about the rears being low, so I’m thinking my theory about hard-coded values is true. Otherwise why would they ask what size wheels are installed?
Unnecessarily inflexible IMO.
ps yes, I put more air in the rears to bring them up to 42psi...
In other cars, when you perform a reset, you’re telling the car that your currently set pressures are now the “right” values so it shouldn’t warn you until they drop by 25% (or whatever) from those settings. That is, if I intentionally want to run much different pressures, I tell the car that by performing a reset.
After leaving the tire shop last night with my new setup, the car instantly recognized the new TPMS and wanted me to reset, which I did. The shop had set the pressures to 42 front and only 36 rear. Driving this morning, I got a warning about the rears being low, so I’m thinking my theory about hard-coded values is true. Otherwise why would they ask what size wheels are installed?
Unnecessarily inflexible IMO.
ps yes, I put more air in the rears to bring them up to 42psi...