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I’ve had one of those delete boxes like token solutions plugged into the 2 rear o2 sensors and just recently I got error codes po161 I believe for short in rear o2 sensors. I checked the box and it flashes a red light now as it used to flash green when working. Any ideas? There is a capacitor in the box that might be burned? Will include a pic. Any help appreciated.
 

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How do I fix these?
Part of a diagram.
But the issue you are having is the heat circuit part. That is not on this diagram. It is a simple load resister. You wil need to find the resister on the board and test it or replace it. That is if the wiring is good.
 

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Looking at a picture will not help. If you look at a wiring diagram for the o2 connectors. You can see what color wire is going back to the unit for the heater part of the sim. Then test it for continuity. Then look at the circuit boat and trace it to the resister. It should be the large heat-sink looking piece.
 
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