Catalytic converter cofes, brlow efficiency threshold
 

Is there a cheat for this using a resistor to fool the computer?

use a spark plug spacer on the rear o2 sensor(s) to remove it a bit from the exhaust stream.

I don't this will help as it looks like the sensor tip is covered with black harden gunk.

Have you tried it?

If the sensor is not failed and still reporting, put a spacer on it.