Postby smj999smj » Tue Mar 05, 2013 11:04 am
Not everyone is available to answer questions 24-7. I do what I can, but I'm also a moderator at NissanForums.com and sometimes answer questions on Jonko's website and NissanHelp.com. I also work 12 hour shifts, five days at a time and have a second job, so I don't always catch every question. I'm sure there are many other members in similar situations, so, one can understand if a question sometimes slips through the cracks, so to speak.
The most likely cause of a P0430 code is an inefficient upstream (or front) catalytic converter on the left side of the vehicle. Usually when an oxygen sensor is at fault, there is also a stored DTC for the oxygen sensor, or a leak in the exhaust near the sensor. Testing for the cause would involve scantool monitoring the rich-lean cycles of the front O2 sensor, Bank 2, and comparing it to the cycles of the reat O2 sensor, Bank 2. There should be an approximate ratio of 2:1, respectively. Rough idle is pretty common on the R51's. Sometimes performing an idle air volume relearn helps. Bad motor mounts has also been an issue for roughness at stops.