我的18CR-V （same model year as 17), 有一次在路上在90多度的气温下以85+ mph 连开了几小时后TPM 突然显示胎压不足！我当时的第一反应是胎被什么东西给扎了赶紧从高速上下来。仔细检查了4个轮胎没有发现任何问题。用胎压计测量发现其实胎压偏高（这很好理解）.我担心所用的digital meter可能不准马上又买了一个常见的杆儿式的胎压计重测了一下，结果和digital meter的读数基本一致！我最后还是把胎压降低到36psi 继续上路了。
2017 Accord TPMS is indirect system, no reason CRV is different
Unlike direct system which measures the real pressure in the tire, Indirect system takes advantage of ABS sensors to compare each wheel's rotational speed to others on a straight path. If one spins faster than the others, the system decides the tire's diameter has reduced due to lack of air, then triggers the light. If all four tires pressure drops at the same rate I guess it wouldn't work.
车是2017 Honda CR-V, 才开2万迈左右。上两月开车时就觉得胎压不足，虽然表盘上没显示胎压不足，还是给胎充了气，还充了不少气才达到标准胎压。现在又感觉胎压不足了，表盘上还是没显示胎压不足。难道胎压监测系统不工作了？还是胎压监测关闭了或出问题了？怎样才能知道胎压数值？谢谢各位的热心回答
如果是Costco会员，他们的轮胎部免费加氮气，只要set适当气压（比如35psi），气泵到压力自动报警。氮气有许多好处，之一是漏气比较慢。
Your TPMS has lost the trigger value to trigger the alarm. You need to recalibrate it to get it to know what the proper tire pressure is.
your manual tells you how to calibrate it.
应该买一个胎压计测一下。感觉CR-V 的TPM 不可靠。
我的18CR-V （same model year as 17), 有一次在路上在90多度的气温下以85+ mph 连开了几小时后TPM 突然显示胎压不足！我当时的第一反应是胎被什么东西给扎了赶紧从高速上下来。仔细检查了4个轮胎没有发现任何问题。用胎压计测量发现其实胎压偏高（这很好理解）.我担心所用的digital meter可能不准马上又买了一个常见的杆儿式的胎压计重测了一下，结果和digital meter的读数基本一致！我最后还是把胎压降低到36psi 继续上路了。
在后面的行程中常担心胎压的事情，每天早上测一下但也没有发现任何问题。所以不知道TPM搞得什么鬼。
再calibration
想拖一拖再去做maintenance
一般如果充满了标准气压后，气压不断下降，那就是那里漏气。 轮胎店里很好查出。
要经常自己目测，至少用手压一压。20PSI 的压上去都是半瘪。
Unlike direct system which measures the real pressure in the tire, Indirect system takes advantage of ABS sensors to compare each wheel's rotational speed to others on a straight path. If one spins faster than the others, the system decides the tire's diameter has reduced due to lack of air, then triggers the light. If all four tires pressure drops at the same rate I guess it wouldn't work.
然后去了轮胎店，店员帮我充了气，态度不错没收钱。过两天我再看胎压是否还减少。
我用的是这种
https://www.consumerreports.org/products/tire-pressure-gauges-34603/tire-pressure-gauge-34471/accutire-ms-4021b-192071/
外面轮胎店里的没几个是准的。