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I recently replaced my catalytic converter clear the P0240 code. For cost reasons I went with an aftermarket converter from autozone.

The P0240 code came back a couple of weeks after replacing the catalytic converter. The light was intermittent but to be safe I replaced both o2 sensors with OEM replacements.

Its been about a week since I replaced the o2 sensors and the P0240 code still hasn't gone off. Does anyone have an idea how to remedy this issue as I've exhausted all of my ideas.

Thanks for your help

 
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Sorry P0420 code

 
Rep Power: 235

Take it someone who has a good enough diagnostic tool to widen the parameters on the O2 system till the code goes away or replace with an OEM cat.

 
Rep Power: 292

420?
Your car wants some weed :P

haha, on a real note though, check ur wires and fuses

Then, unplug the negative terminal on battery for like a couple mins, tap the terminal on the negative post to create a "spark"
then just reattach the negative terminal
hopefully that should reset the sensor

I suggested this like on another recent thread, try it out