So the other day I was in stop and go traffic and the van started to vibrate really really bad. So Bad I couldn't drive it. Pulled off the road, had it towed. The garage guy said it was misfiring and changed #4 coil and since he had the intake off, all six plugs. He put it back together road ok but then got really rough again, he took it apart and replaced #4 fuel injector. Got it back, engine seems really rough but RPMs are staying very steady, engine just feels rough at idle. Week later MIL comes on check the code with the handy little turn key trick; since I do not have a code reader and I get P0430. I take it to someone I trust, they plug in looks like one of the o2 sensors. Cleared the code and drove for about another week and now the MIL is back on same code P0430. Does anyone have any info to help me out. Should I replace the 02 sensor or is it something different?

 

Took it to the local dealer. It turns out the catalytic converter is bad. They are replacing on an extended warranty coverage that is imposed by the US government. Hopefully it clears everything up. I will let you all know when the catalytic converter is installed, they have to order the part.

 

If it doesn't work out, I'm looking for a motor donor.

 

It's pretty cut and dried at least according to this. Leak, O2 sensor or cat.
http://www.obd-codes.com/p0430