I've had my 2014 Lexus IS300h F Sport for around 3 Years. Never changed the Air Con gas.
I switched the air con on just to see if it works as the days were getting warmer. It wasn't working and blowing warm air. As I have never re gassed the AC, i took it for a re charge and it failed. The charging machine came up with an error code B1423, which is generally associated with the AC pressure switch (located at the front of the car near the grill).
I looked online for the genuine part (https://lexuspartsdirect.co.uk/product/lexus-is-phase-3-a-c-pressure-sensor/) and it was £300!! I went to a mechanic friend and he advised me that most Lexus/Toyota pressure sensors are the same and the error code could also be that the pressure isn't getting to the sensor in the first place, so it could well be the compressor. He advised to buy the same part on ebay for a tenth of the price:
https://www.ebay.co.uk/itm/324187998809?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=4R6HUeZQQjG&sssrc=2349624&ssuid=rm8E24gDQZK&var=&widget_ver=artemis&media=MORE,
Same brand, same manufacturer of the "official" sensor.
I replaced the pressure sensor, relatively easy to do but have to be careful when taking old one off as it could snap the base it screws on to.
Re-gassed the air con and thankfully the car AC was working again.