I can check my tires using multiple gauges including a very expensive Autometer and the pressure on all 3 matches. When I check the pressure on the vehicle tpms screen it shows all the tires 3lbs lower than the gauges. I have tried the tpms reset procedure many times but hasn't made any difference. Can the tpms system be re calibrated?

 

If you've now got a rather accurate offset value - why worry about it. I don't believe the TPMS system is for accurately maintaining tire pressure but for warning you when things go bad (leak). I can't get accurate MPG figures out of the on board computer........

 

I didn't know you could see tire pressure. How do you do that? I doubt my car lets me. Like he said TPMS is more for showing a disparity in pressures rather than an optimal inflation pressure reading.

 

It's part of the center display menu on the F56's

Status display
On the onboard monitor, the current status of
the Tire Pressure Monitor TPM can be displayed,
e.g., whether or not the TPM is active.
1. "Vehicle Info"
2. "Vehicle status"
3. "Tire Pressure Monitor (TPM)"
The status is displayed.

 

It's gotten cold here now, and I got a tire warning while driving. Oh crap, I said, thinking I had a flat. Checked the TPMS, and nope! All 4 read 30 psi, and change. That's a bit OCD, on the car's part! I topped them each up, and now the TPMS reads 35/34 across the board.

 

We've had some below 0 temp readings over the past few days. I also got the same warnings and tire pressures were 27-28. Pressures rose during the day as temps rose. It was interesting to leave the graphic display with tire pressures on and watch the tire pressures go up while driving.

I'll need to watch pressures and add air if they don't go back to reasonable levels.

 

I bought a Craftsman tire pressure gauge. Works great. My readings on the TPMS ZWERE ALL OVER THE MAP.

 

The TPMS "warnings" in cold happen with other cars. You can use nitrogen to eliminate it if they do it right. It's the moisture in the tire that expands/contracts with temperatures, not the gas inside. There's no water in the nitrogen bottle.