2001 mitsubishi montero catalytic converter and o2 sensors replaced an still getting same codes p0155 p0161, does anyone have a cure for this problem[/COLOR]

 

Two questions:
1. Did you replace ALL 4 O2 sensors? Both codes are indicating malfunction of the Heated O2 sensors (before the cat converter).

2. What brand is the catalytic converter? Is it Mitsubishi, or an aftermarket? I read somewhere that using some of the aftermarket catalytic converters does not work on m. any of the Mitsubishi models. Something to do with the efficiency of the cat converter and if it's not working just right - computer signals O2 sensor issue. It is possible that the signal ratio between front and back O2 sensors is off and that's what throwing the code.