I'm planning to replace my OEM wheels on my 2014 Civic Coupe. I'm told the TPMS is not in the valve stems and viewing this confirms that, but are monitored somewhere within the wheel wells of each tire. Can someone elaborate the location of these sensors and if I can simply remove the OEM and install different wheel whether OEMs or aftermarket? Thanks

I'm not 100% on the 9th gen, but if it's anything like the 10thgen (which uses the ABS and wheel speed sensors for "TPMS"), then you should be able to swap wheels and recalibrate TPMS.

Basically, how that works, it looks for differences in individual wheels speeds to determine if one more more tires are flatter than the other. Downside to using an indirect TPMS is if every wheel goes down at the same rate, but under spec, then you're not gonna have indication. Happened to my 2018 where every wheel went down to 25psi

I would assume the same with 9th and hoping I don't experience all dropping together.

You could lose pressure on all 4 tires when you get a cold snap or winter sets in. No big deal. Add air as needed and recalibrate the TPMS. Try to remember to recalibrate the TPMS when your tires are cold.

I have a 2015 Civic LX and have to recalibrate the TPMS when I swap to my winter wheels. Then again in the Spring when I put the all seasons back on. If I forget I get warning.