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Fehler P0171 und Drehzahlschwankungen in N

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Hallo,

ich fahre einen 6er Golf R (BJ 12/2009) mit DSG und ca. 122000 km.

Seit einiger Zeit habe ich folgendes Problem:
Wenn ich während der Fahrt in N schalte, schwankt die Drehzahl zwischen 1200 und 1500. Das passiert nur bei Geschwindigkeiten ab ca. 70-80 km/h. Im Stillstand tritt das Problem nicht auf. Mir kommt es auch so vor, dass das Problem etwas temperaturabhängig ist. Bei hohen Außentemperaturen tritt das Problem weniger oft auf.

Heute (ca. -6°) ist jetzt die Motorkontrollleuchte angegangen. Mit meinem OBD Habe ich den Fehlercode P0171 ausgelesen (System too Lean (Bank 1)).

Was kann das sein? Falschluft durch eine Undichtigkeit? Luftmassenmesser?

Vor etwa einem Jahr hatte ich das gleiche Problem, allerdings traten die Drehzahlschwankungen da auch im Stillstand auf (gleicher Fehlercode). Problem war damals Falschluft. Das ganze hat mich trotzdem mehrere Hundert Euro beim Freundlichen gekostet. :(

Im Netz habe ich das hier zu meinem Fehlercode gefunden:
Spoiler anzeigen

VAG Error Code: 16555/000369
EOBD II Error Code: P0171

Fault Location:
Fuel Trim, Bank 1 - System too Lean - Intermittent

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Excessive Fuel Consumption.

Intake/Exhaust System Leak(s).
Secondary air injection (AIR) system.
Manifold Absolute Pressure (MAP) Sensor (G71).
Mass Air Flow (MAF) Sensor (G70).
Engine Coolant Temperature Sensor (G62).
Fuel pressure/pump.
Injector(s).
Activated Charcoal Filter Solenoid Valve 1 (N80).
Incorrect Positive Crankcase Ventilation (PCV) hose connection.

Possible Solutions:
Check Mass Air Flow (MAF) Sensor (G70).
Check Engine Coolant Temperature Sensor (G62).
Check Fuel Pressure Regulation.
Check Fuel Pump (G6).
Check Injectors.
Check Intake/Exhaust System for Leaks.
Check Secondary Air System for Leaks.
Check Vacuum Pipes for Leaks.
In the vast majority of cases, simply cleaning the Mass Air Flow (MAF) Sensor (G70) does the trick. It's best to take it off and spray it with electronics cleaner or brake cleaner.
Read Measuring Value Blocks (MVB).
At idle Adaptive value > 5.02%.
At part load Adaptive value > 21%.

Special Notes:
Fuel Trim Information.

Tech Notes:
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front Oxygen (O2) sensor may need to be replaced.

VW and AUDI Engine code P0171 P0174 P1136 and P1138

When is the code detected?:
Fuel injection system does not operate properly.
The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Description:
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the Engine Control Module (ECM) judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).

As taken from my EOBD II Fault Codes Software
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