[emdubya]

Looking for advice. Just got a 2A7C and 3100 code on my 135i after replacing valve cover gasket and PCV valve.

After I finished the job the car started up fine, ran for a couple minutes then suddenly started running rough, and threw the CEL and codes.

Only thing I can think of was when I was screwing the PCV valve in, I heard a small cracking noise as I finished. Could I have damaged the PCV valve or valve cover by screwing in the PCV valve too far? Would that even cause these codes?

Here's the report from carly - note that the codes for the Pre cat 02 sensor and the post cat bank 2 O2 sensor kicked in just a couple days *before* I did the valve cover gasket.

Fault Report - Carly for BMW - Version: 27.60 FV

ID1: 873f5943-10d0-400a-811f-c9b037b6a4c5-861
ID2: f6b76aca-c64d-497f-9ce0-875e32d2d03a-d1c-45b6
INFO: USB-MODE
Base: E87
Build-Year: 2009
Faults: 6
ECUs: 16
Filter: just found
Model: 1 (E81, E87) Automatic engine recognition (MotorID=86, Parameter=28)
Battery: no battery info
ADDITIONAL OBD: OFFNormal communication
Normal connection
normal
C 2
Date: 2018-02-10 15:46:33
USB Device
Version: 21
Device: >samsung< >hltevl< >SM-N900W8<
Motor Control:
Engine / Motor
AfterCat 02 sensor signal at full load
Code: 002C7C
PreCat 02 throttle sensor, Bank 2
Code: 002C2E
:Lambda probe after catalytic, electrical: Short circuit to positive / VANOS intake, cold start: not adjustable / Electronics - Lambda probe after catalytic converter / Lambda probe heating in front of catalytic converter
Code: 002A7C
:Boost pressure control 2
Code: 003100
ABS / DSC / Brake:
Dynamische Stabilitaets Kontrolle / DSC
ECU not present/no response from ECU
Airbag:
Airbag
ECU OK, no Fault Code
Transmission Control:
Transmission / Getriebe GS 19
ECU OK, no Fault Code
Instrument cluster:
Instrument cluster / Kombiinstrument
Phone failure
Code: 00A554
Central info display / Zentrales Display
ECU not present/no response from ECU
Heating / AC:
Air conditioning / Klimaanlage
ECU OK, no Fault Code
Immobilizer System:
CAS
ECU OK, no Fault Code
Park distance control:
Park Distance Control / PDC
ECU not present/no response from ECU
Sunroof / Roof:
Sunroof / Schiebedach
ECU not present/no response from ECU
Roof / Dach
ECU OK, no Fault Code
Audio/Navi/Communication:
Phone / Telefon
ECU OK, no Fault Code
Hifi Amplifier / Verstaerker
ECU not present/no response from ECU
Tuner Antenna / Antenne
ECU not present/no response from ECU
Hybrid Radio USA
ECU not present/no response from ECU
Digital Satellite-Tuner USA
ECU not present/no response from ECU
Navigation
ECU not present/no response from ECU
CD-Changer / Wechsler
ECU not present/no response from ECU
Audio-System
ECU not present/no response from ECU
Video
ECU not present/no response from ECU
Seats:
Seats / Sitze
ECU OK, no Fault Code
Seats / Sitze
ECU OK, no Fault Code
Systems:
Junction Box Passenger / Beifahrer
Internal error of the sensor - K-LIN 6 xAUC sensor
Code: 00A6CF
Fuel pump / Kraftstoffpumpe
ECU OK, no Fault Code
Tire pressure control / Reifendruck Kontrolle
ECU not present/no response from ECU
Passive Go System
ECU OK, no Fault Code
Car Communication Computer CCC
ECU OK, no Fault Code
Car Communication Computer CCC
ECU OK, no Fault Code
Car Communication
ECU not present/no response from ECU
Anti-theft alarm system:
Interior protection / Innenraumschutz
ECU not present/no response from ECU
Theft alarm / Diebstahl Warnanlage
ECU not present/no response from ECU
Body:
Trailer / Anhaenger
ECU not present/no response from ECU
Fussraummodul /FRM
ECU OK, no Fault Code
Other:

[buster84]

It's could be a hickup with the tune if you have one or the vanos got dirty. Disable your tune (if you have one) and Try deleting the codes and starting the car again to see what happens. I'd also make sure your oil is filled to good on the oil gauge (if you removed any)