Help Needed - SES Codes 215,225,227,235(INPA)

[LeiZ]

Update_11.21.2015 : Hi Gents, Sorry for being away for so long. Business trip took me 3 weeks to get back to normal. I really appreciate every bit of advice here. And as I promised, I'll be back with the fuel pressure test results and see if I can rule out the fuel pump/filter/injector issue.

Basically Actron CP7818 gave me a fairly clear reading. Priming (w/o starting) shows 42~46 PSI, upon starting 50~52 PSI steady. Tried both high and low throttle, pressure never go beyond +/- 1 PSI.

So I guess the fuel system is doing fine. I checked the codes again (Dad's been driving it while I left), and he codes still exist, same ones. Also, I did a quick test by disconnecting the MAF while engine running, it's fairly big idling change, so I guess MAF is still working. Thanks again for all your help again!
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First off, Happy Holloween!!!!!

Really need some help here. My 01' M54 3.0i was throwing me 4 codes since 2 weeks ago. Checked with INPA, codes are 215,225,227,235. Cleared then came back within 1 mile of driving. Car is still driving fine, w/o noticeable difference, maybe only 1~2 mpg down, but that's it. Both upstream & downstream 4 O2 sensors have been replaced recently.

Here's a quick summary:

225 Reaction time NKAT-Probe BK2
Errorcode: E1 B2 25 28 15 A2 00 00 95 99

235 Oxygen-sensor control upstrem bank 1
Errorcode: EB B2 05 26 19 A1 00 00 95 AA

227 lambda contol tolerance Bank 1
Errorcode: E3 B1 01 1F 32 34 8B A1 95 BF

215 downstrem sensor, active test BK1 (Probe 3)
Errorcode: D7 72 01 28 02 19 20 34 95 F6

Any help will be greatly appreciated.

Thanks,
Lei