Chinese AFR meter is of questionable quality

sam2019

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Few people will ever feel the need to invest in an AFR meter but if you do stay away from this one:

https://www.aliexpress.com/item/1005003599132669.html

After only 2 month it stopped working. I am not sure if the sensor or the instrument died - my guess would be the sensor because the instrument runs thru its initialization - but then only displays 3 dots in the middle of the screen and no values. We spent literally hours to check all the electrical contacts to make sure it wasn't the reason for this failure - to no avail.

Also: although there are 2 meaningless 5-star reviews on the Aliexpress site for this product I seem to be unable to add my own review in spite of the fact that I purchased it. Ali is even worse than Amazon when it comes to faking reviews it seems.
 

sam2019

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We deep cleaned the sensor with carburetor cleaning spray. After that we re-installed it and it showed values however the values did change very slowly (much slower than before) so they may be arbitrary and not really what should be indicated.
Also: the instrument remained DARK after ignition was switched on UNTIL the + pole was dis- and the re-connected. Every time. I have no idea how and why this happened. I have a new sensor on order but I don't have a lot of hope it will work as before (and maybe even longer??)

pics: reference pic from catalogue, blackened sensor.
 

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Dool

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Unfortunately in this application the O2 sensor is a consumable part because it does not have the functioning Heater Circuit that would help to keep it clean, but to tune correctly an AFR meter is invaluable.
 
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