multiple codes on a 2002 santa fe 2.7. v6
 

I was driving on the highway and the MIL came on. When I got home I decided to scan it. Too many codes!! :eek:
P0174 P0171 System Too Lean Bank 1 and 2
p1167 p1166 O2 Sensor System Lambda Controller at the Limit Bank 1 and 2
p0455 p0442 EVAP Emission System Leak Detected Large and small Leak
I did a visual inspection and everything looks ok. Any ideas????:confused:

Looks like there is a large vacuum leak in the EVAP system which is leaning out the fuel mixture. Better have the EVAP system smoked to find the leak.

yauzza!
 

Thanks NovaResource I smoked the intake myself and found that the throttle body ($40 at the salvage yard.) was leaking from the seal of shaft that opens the throttle plate. And I also replaced the purge valve and that fixes two other o2 limit codes that were showing up after I changed the throttle. No codes!
:D

Nice work!