I have 3 units. 1 old model OBD1READ and 2 Toyocom (batch 1 and last batch )
I used the OBD1READ for more than a year connected all the time in the engine bay. Exposed to the elements and extreme heat in the summer. Keeping the Toyocom for CEL code reading only safe at home.
After more than 1 year I started to get annoying disconnections, it was acceptable no electronic device can survive the harsh conditions of the engine bay.
I started to use the Toyocom and ordered another unit as a backup I received one from the last batch and it did not work at all.
The last update of the Toyobd1 app fixed most of the problem with the last batch.
I found out that the old OBD1READ is working properly if kept at normal temperatures
Now to protect the Toyocom and OBD1READ and keep it far from hot engine I install it inside the rig cabin
The installation in the cabin near the AC will contribute to the device longevity
Installation of OBD1 dongle in cabin without taping into OEM wiring
About the pics in the above thread I got Crap from mud members that my rig is disgustingly dirty (as veteran that drive most of adult life in combat vehicles I can say "frankly my dear I don't give a dam"
In the next video you can see how i found that one of my O2 sensors is dead.