romer

Just curious how accurate you've found the TPMS to be on the RDX. I have several tire gauges and they don't all agree so I can't know how accurate the RDX readout is on the dash. Thanks.

mrgold35

TPMS only shows the PSI within the tires. A tire gauge is usually calibrated to sea level and show the PSI of a tire in relationship to normal sea level air pressure. I have about a 2 PSI difference between TPMS and hand held gauge at 5000-5400ft in my home town. The PSI difference is greater as I go up in elevation. I use TPMS as an alarm to not go below X PSI instead of an exact PSI measurement tool.

Poolman

Notice that mine may change just a pound or so, depending on the heat of the day and how long I'm on the road. Also might make a difference, I had my dealer fill them for free with Nitrogen .

jcross1231

Mine is dead on. Note that tire pressure varies with ambient air temperature - about 1 psi per 10° temperature change.

mrgold35

There might be several things going on at the same time:

- normal fluctuation of PSI with temp changes with the ambient air, sun/shade on the tires, or increased PSI after driving on a hot road
- inaccurate PSI gauges
- elevation, hand tire gauges may start to read +1 psi off at around 2000 feet and 2-3 PSI off +5000 feet

I have a portable air pump and check my tires (and spare) in the garage early in the morning. TPMS always seem to be +/- 0-2 PSI off at all four corners after driving around for any length of time.

Kelv00n

Mine is very, very accurate when I check in a proper environment, which is to say: mid-morning, inside my garage, and before the car has been driven at all (I live in SoCal by the coast, so not too hot or cold). Of course, change any of the above conditions and your readings might be off, but that's probably not the fault of the car.