2002 new beetle codes

[roadman]

I have a 2002 beetle showing 1151 and 1142. I have replaced the MAF, O2 before the converter, throttle body, plugs, fuel filter and now I can clear the codes but they reappear after running the car for a few miles. I have a VAG-COM and that what I used to read the fault codes and clear them. If anyone can help me I would really appreciate it very much.

[roadman]

This is the result of my AUTO-SCAN

VAG-COM Windows Based VAG/VAS Emulator
Version: Release 607.3-UD http://www.Ross-Tech.com
Workshop Code: 000 00000 Self-Diagnosis Log Monday,23,October,2006,16:21:21
Chassis Type: 1C - VW Beetle
Scan: 01 02 03 08 15 17 19 22 35 37 46 54 56 75
VIN Number: 3VWCB21C42M438612
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Address 01:
Engine Part No: 06A 906 032 GF
Component: 2.0l R4/2V G 4076
Coding: 00003
Shop #: WSC 00066 3VWCB21C42M438612 VWZ5Z0B0151404
2 Faults Found:
17560 - Long Term Fuel Trim Additive Air; Bank 1; Range 2: System too Lean P1152 - 35-00 - -
17549 - Load Calculation Cross Check: Implausible Value P1141 - 35-10 - - - Intermittent Readiness: 0010 1101
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Address 02:
Auto Trans Part No: 01M 927 733 MA
Component: AG4 Getriebe 01M 4971
Coding: 00011
Shop #: WSC 00000
No fault code found.
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Address 03:
ABS Brakes Part No: 1C0 907 379 J
Component: ABS FRONT MK60 0103 Coding: 0004097
Shop #: WSC 00066
No fault code found.
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Address 19:
CAN Gateway Part No: 6N0 909 901
Component: Gateway K<->CAN V082 Coding: 00006
Shop #: WSC 00066
No fault code found.
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Address 46:
Central Conv. Part No: 1C0 959 799 G Component: 2K Komfortgerát HLO 0004 Coding: 00064
Shop #: WSC 00066 Part No: 1C2959802A
Component: 2K Tõrsteuer.FS KLO 0004 Part No: 1C2959801A Component: 2K Tõrsteuer.BF KLO 0004
1 Fault Found: 01044 - Control Module Incorrectly Coded 35-00 - -
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Address 56:
Radio Part No: 1C0 035 157 D
Component: Radio DE2 0006 Coding: 06031 Shop #: WSC 00066
No fault code found.

End

[GTRAFF]

System too lean sounds like a vacuum leak. Check the vacuum hoses under the hood for cracks. The cloth covered hoses conceal the leaks.

[roadman]

I took the beetle out for a drive with the vag com hooked to it, I had rpms, maf, throttle position, and O2 sensor voltage. The one thing I noticed was the voltage on the O2 sensor was kind of eratic when I first started running about 30mph. Then on the highway there were a couple of times I noticed the voltage drop in half or more and then come back. Then every time I let off the gas at highway speeds the voltage would drop all the way to the bottom of the scale, and then slowly come back up. At city speeds it did not do this. But every now and then at city speeds the voltage would spike down and then back up to where it was. I am looking into vacuum leaks like you said, just thought I would pass this by you to see if this conferms your diagnoses or gives you other ideas. If there is anything else you think I should monitor while driving let me know and I will try it. I really appreciate your help.