So I've just bought a 08 is350 premium pkg last month which came with after market exhaust and intake. After driving it for a week cel came up took it back to the dealer they said its the mass airflow sensor they cleaned it should be fine. Next morning cel is back and after two days it went away and its back again today!! After couple of days later its gone again but mean time I pulled the codes which are "P0101 mass or volume air flow a circuit range/performance." And "P0174 system too lean bank 2." Anyone else had this issue before? And should I be worried? Thanks

 

With those codes, the maf is probably in need of replacement.

I would take it back, they should recheck it for free as they misdiagnosed it the first time.

Which intake?