I have a bad cat. converter in my 03 RSX-X and the check engine light is on (code 0420). However, the car runs perfect so I was wondering if there is a way to fake out the signal generated from the secondary o2 sensor to make the light go off (for inspection). I am not sure, but I thought that o2 sensors put out a certain resistance, and if that is the case could I just solder in a resistor that satisifies the ECU range and make the light go off? For this I would need to know the output of the secondary o2 sensor while the car is running and put that resistance in the circuit and bypass the o2 sensor all together. Option two would be to reset the ECU, which clears the code, log enough miles to write the history file (i think like 50 miles) and hope I can get it inspected before it goes back on. Are either of these two options feasable? or am I thinking way too deep for a $200 aftermarket cat. which would slove the problem?

Thx.

 

Probably just the O2 sensor. But the signal out of the second o2 sensor doesn't vary as much as the first one.

I would have to look to see what voltage you would need. Either .1v or .8v.

Someone else know what the lean signal voltage would be.

Could you borrow one from a friend for a bit.

To test the voltage you really need a scope. But if you have an automotive meter you can get close.

You need to see the voltage between .1v and .9v so the 1v scale will work.
Also you need to see the voltage changing 8 - 10 times a second. Going up and down.