Hi everyone,
I have a small weather station based on a esp8266 running esphome. One of the sensor is a BMP280 3.3V over i2c, the sensor was working ok until yesterday, it suddenly went down to a solid and fixed -136.9 C⁰ (it doesn't change) and pressure of -4.2 hpa (it changes if blow some air over the sensor). I checked it out with a simple Arduino sketch on a different board but it I got the same results.
Any idea, is it broken?
Here is pic a of front and back View.
Check the PCBs for corrosion due to condensation and electrolysis. Any out-of-doors electronics will fail sooner or later, unless very carefully protected from the environment.
The module itself is old (2 years since I bought it), but It was on its antistatic bag. It was running for about a month chilling on my desk. Not visible rust.
Please, post a picture of your BMP280 sensor.
Posted! There is some rust over unused pins, but I think it shouldn't being the problem. I also use different wires
Which Arduino (UNO, NANO, MEGA) you have used to test the 3.3V-I2CBMP280? Have you used level shifters?
I tested it out on a esp32 and a 32u4, same results.
Tells me it's time to remove and replace.
Ron
I think so, could it be because of high humidity? Is always over 90%
I do believe that could weigh in as a primary contributing factor. 
Ron
You might want to look at something like an SHTC3 from Sensirion. It's rate up to 100% humidity and 125 degrees C so it might last a little longer than a BMP280.
Hi,
Humidity sensors do not have a long lifetime as they are exposed to a corrosive atmosphere.
I would say is bereft of life, gone to meet its maker, an ex-sensor.
Tom.. 
PS. The Norwegian Blue was luverly model.
Every sensor the OP puts in the environment to be sensed is going to be subject to the same environment. The sensor doesn't change the environment that it's sensing.
And oxygen is corrosive to ALL sensors. Not just Humidity sensors.
And there is not debate between a BMP280 or a Senserion sensor like an SHTC3. The SHT is just a better sensor. It has a longer lifetime, more accuracy, larger operating range. I mean, there's just no comparison.
OMG,
I'm not sure that the line would be funny if I were sober, but right now I find it ridiculously funny 
These are even better if you can afford them.
They get washed every 6 to 9 months, last just over a couple of years in a production line bakery.
Changing the replaceable filter helps too.
Tom..
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