Anytime you check/set your tire pressures... you should reset the TPMS. That will give the TPMS computer a "target pressure" to monitor. Many people do not do this. I think the system gets confused and has a brain fart. That is why I always reset the TPMS when ever I check my tires. You should check the tire pressure every other or every third fuel fill up. It also would not hurt to check the oil level while your at it.