AC130 Spectre 8/24/2010Ok first, these codes refer to "system too lean at idle speed bank 1, bank 2"
There is a chance that its just a vacuum leak, probably your crank case vent hoses split up but here are the other reasons for it.
Sounds like MAF, the air intake boot has fallen off the throttle body or a huge vacuum leak. The MAF knows how much air is going in and it tells the computer how much gas to put into the mixture. The O2 sensors confirm what is going on. If more air is going in than the MAF is saying the O2 sensors pick up a lean mixture. For both banks to be lean it has to be something that both banks have in common. . .MAF, air boot or vacuum leak. Additionally, the MAF would set it's own code.