2003 X5 Repair Help

This is kind of a follow up to my last thread (http://www.bimmerfest.com/forums/sho....php?p=6924596)

I got the OBD II Codes read and they came out to this:

P1500- The manual doesn't show this code for some reason
P0174- System too lean (bank 2)
P0171- System too lean (bank 1)

I can't fix anything if I don't know what's wrong, so if someone by any chance knows what the first code means, please let me know, I'd really appreciate it.

Thanks!

P1500 Idle Speed Control Valve Stuck Open (BMW)

I would check for leaks in the rubber boot connected to the throttle body and/or the vacuum system.

I'll check that out