Cab_and_Wagons

I've been chasing a reoccuring code on our 2002 allroad. The codes it's been throwing are. 11547 Long Term Fuel Trim Too Rich
11545 Long Term Fuel Trim Too Rich (Intermittant)

I looked at the OBD-II Freeze Frame, and here's the result:

Freeze Frame Data for address 10
PID02 DTC that caused freeze frame data storage: P0175
PID03 Fuel system 1/2 status: Closed loop, using O2 sensors
... Closed loop, using O2 sensors
PID04 Calculated load value: 2.7 %
PID05 Engine coolant temperature: 87 °C
PID06 Short Term Trim - Bank 1: 2.3 %
PID07 Long Term Trim - Bank 1: 10.2 %
PID08 Short Term Trim - Bank 2: 2.3 %
PID09 Long Term Trim - Bank 2: 10.2 %
PID12 Engine RPM: 640 /min
PID13 Vehicle speed: 3 km/h

I read the great piece about Fuel Trim, and the long term trim looks like it's just over 10%

I don't have a complete autoscan on this computer. Any chance you can help me identify what the cause is?

Thanks,

Tony<ul><li><a href="https://forums.audiworld.com/vag/msgs/456.phtml">https://forums.audiworld.com/vag/msgs/456.phtml</a</li></ul>

Cab_and_Wagons

VCDS Version: Release 805.1
Data version: 20081017

Friday,14,November,2008,11:39:12:11761

Chassis Type: 4F - Audi A6 C6
Scan: 01 02 03 05 06 07 08 09 0E 0F 11 13 15 16 17 18 19 1E 20 28
34 36 37 3D 42 46 47 4C 4F 52 53 55 56 57 5F 61 62 65 67 69
6D 72 76 77

VIN: WA1YD64B42N152658
-------------------------------------------------------------------------------
Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 4Z7 907 551 M
Component: 2.7l V6/5VT G 4000
Coding: 06752
Shop #: WSC 03109
WA1YD64B42N152658 AUZ7Z0B2142955

2 Faults Found:
17545 - Fuel Trim: Bank 1 (Add): System too Rich
P1137 - 35-10 - - - Intermittent
17547 - Fuel Trim: Bank 2 (Add): System too Rich
P1139 - 35-00 - -
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: None
Part No: 4Z7 927 156 F
Component: AG5 01V 2.7l5VT USA 1818
Coding: 01002
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 4Z7 907 389 A
Component: ABS/ESP allrad D55
Coding: 06497
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass Labels: None
Part No: 4B0 959 760 C
Component: Sitzmemory R1 BF 0103
Coding: 00003
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: Redir Fail!
Part No: 4B0 820 043 AD
Component: A6-Klimavollautomat 0105
Coding: 00010
Shop #: WSC 02325

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4B0-959-655-AI84.lbl
Part No: 4Z7 959 655 E
Component: Airbag 8.4E 5000
Coding: 0000307
Shop #: WSC 02325 785 00200

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4B0-907-487.lbl
Part No: 4B0 907 487 H
Component: Lenkradelektronik D01
Coding: 01012
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-920-xxx-17.lbl
Part No: 4B0 920 981 P
Component: KOMBI+WEGFAHRS. VDO D11
Coding: 06264
Shop #: WSC 20108
WA1YD64B42N152658 AUZ7Z0B2142955

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control Labels: 4Z7-907-553.lbl
Part No: 4Z7 907 553 E
Component: - 2C1A1 D040
Coding: 25500
Shop #: WSC 09999

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 4B0 959 760 B
Component: Sitzmemory R1 F 0102
Coding: 00001
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4Z7-907-357.lbl
Part No: 4Z7 907 357
Component: dynamische LWR D09
Coding: 00001
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 4B0 035 195 J
Component: symphony II NP2 0050
Coding: 00205
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 8Z0-919-283.lbl
Part No: 8Z0 919 283
Component: Parkingsyst. A6 RDW D08
Coding: 01186
Shop #: WSC 00000

No fault code found.

End ---------------------------------------------------------------------

quickaudi:STFA

could possibly be that your oxygen sensors are starting to fail.

Cab_and_Wagons

code reappeared two days later. I'm thinking Fuel Pressure Regulator. I can't find any vacuum leak, and the idle is smooth. I'm stumped.

quickaudi:STFA

when was the last time you replaced your plugs and air filter, check for boost leaks (though that should show up...)