So I noticed when I got my car the front right tire was always 1 psi below the other ones. I thought maybe it was the location, today I got a tire rotation and put the front to the rear. That same tire still is 1 psi below the other ones. It goes up along with the other as I drive but it's always 1 psi below or so. Do you know if it's normal? Are the tire sensors accurate? Do you guys have all your tire pressure readings the same for each tire?
How likely is it that I have a leak? It goes up I believe the same when the other goes up but it's 1 psi below for some reason.
The Challenger is my first car with TPMS (ignoring my brief 4 weeks with my 2008 Cayman S -- taken out by run amuck '89 Volvo). The tire pressures were off some when I picked up the car. The dealer employee said the differences were due to uneven tire heating due to the lack of sufficent drive time so something to that effect.
I do recall from my brief time with my Cayman S there is some truth to this so I didn't think about it.
But it bothered me. I got out my tire pressure gauge -- a dial gauge that "remembers" the reading so if one blinks he doesn't miss it -- and found the tire pressures were wrong. I set them.
Then at some point commanded the TPMS system to perform a reset. I think. That is I recall doing this with my new JCW -- oh the pain of having to learn two new vehicles -- but I think I also did it with the Challenger. (I'd go out and check to see if this is possible but the car is going through a software upgrade and I don't want to inadvertently interrupt/interfere with that by unlockig the car and starting the engine.)
If I did then the TPMS system measured the tire pressures as i drove the car. The readings began to look a lot more reasonable/better. Still some differences though.
During another round of settng the tire pressures I paid closer attention to the gage needle. I then noticed I had kind of been sloppy. The gauge was reflecting what the TPMS system was reporting. The 2nd go around I was more careful and more precise.
And now tire pressures cold -- after several hours of non-use and out of direct sunlight -- actually after the car has sat overnight -- read the same. Under way they pretty much all change together although some times one tire or both tires on one or the other side may differ by a a degree or two. Normal.