P0430 --> P0171 Bank2 to Bank1

[jfrano]

Have a 2001 Maxima. That gave a P0430 bank2 error. After much research. I had the y Cat replaced and the downstream o2 Sensor. The P0430 has gone away I'm now getting the P0171, which relates to Bank1. Any idea why I'm now getting Bank 1 errors. I guess, since the P0171 didnt exist before, somehow what I did to fix the P0430 caused the P0171...does that make sense?

Thanks

[jfrano]

Any ideas on this one?

[yangs13]

p0171 i believe is "system too lean", so i guess check air issues. mass air flow sensors are common issues on max's