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2001 Infinity I30 P0430 Code keeps coming back.

I have a P0430 code on a 2001 infinity i30t. At first I just shut off the code and it didn't come back for about 6 months. Then it cam back so I started using Lucas fuel injector cleaner in my gas and it stayed away for months so I stopped using the additive. Not it cam back and when shut off it cam back in about 30 miles. Yesterday I removed the bank 2 (front) Cat and both O2 sensors. Nothing looks clogged or damaged. I looked at a plug on that side (NGK) it was a nice tan color. I used a propane torch and heated up the two O2 sensors and the pre cat sensor went up to about .95 volts but the after cat sensor went up to 1.25 volts. I don't mind spending the money (too much) on parts but I'm not sure what is causing the problem. Any suggestions before I put it back together or just bit the bullet and order some parts. The car has about 125,000 miles and runs pretty darn good.Thanks,Garygbressler@aol.com

Vehicle: 2001 Infinity I30 V6
asked Jan 28, 2013 by anonymous

1 Answer

Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem.
answered Feb 1, 2013 by G37driver (3,517 points)
I gave in and ordered both sensors and an Eastern Cat replacement converter.  Since the down stream sensor seems impossible to replace without removing the converter I don't want to remove it again.  I sure hope this helps and I'll update next week when the parts arrive.
Thanks a lot.
OK, I installed the Eastern Cat replacement and both O2 sensors and have not seen a check engine light since.  I actually believe the car idles better than before.  I had a little trouble with the heat shield they put on the Cat because it gets in the way of the bolts when installing it.  Even harder to get a socket around the nuts to tighten them.  I wrote to eastern to tell then and got a very nice response and they are going to look into modifying the shield.  Very happy so far.
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