So I've burnt out my Bosch Wideband O2 Sensor in less than 9months and 10,000km, probably because of shock cooling. This seems to be very common unfortunately. See below for a very interesting article on why sensors last 100,000km+ in stock applications, but fail much quicker in aftermarket installs.
The Question: Is there a circuit or wire that only has Power when the Engine is running??
Or one at the ignition barrel that gets power when the Key is on Start?
I could use a relay to pull on, and hold until the ignition is fully turned off.
I tried to find a wire like that last year when I installed the Wideband, but had no luck. But I only checked for circuits at the Fuse Boxes (LH engine bay, and RH front interior). After checking every Fuse, they all got power when the Ignition was turned on (engine still off) .
*Why Bosch Wide-band air/fuel ratio sensors fail so often in aftermarket applications*