Computer problem
2001 BMW 325 6 cyl Two Wheel Drive Automatic 83660 miles
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01 325 have a service eng light on ck codes found bank1&2 are lean code po172 &po174 ck for a vaccume leak found none also replace the intake manifole gasket the light is still on I can clear it and about 50 miles it comes back on need your help vehicle is due for emission soon

There are several issues that can set the faults you have reported. The history of the vehicle is one of the things that will help find a solution. Has BMW requested the car for any recalls? Are you a California resident and is this a California car? Is it a SULEV car? If it is not an M-56(SULEV) motor, has the cyclone separator ever been replaced? If the separator fails, it can set these faults and can also command the service engine soon lamp on. Also, when reposting with these data, please include the vehicle identification number