Hello, I have a 2002 A4 1.8 T Quattro, and over the past month, I've noticed that when the weather is very muggy/snowy, and I'm using my car a lot, it often goes into Limp Mode (I think). The CEL, ESP, and traction lights come on, and it's as if the Turbo shuts off. It takes an extremely long time to accelerate, and I can't seem to go past a certain RPM and speed (roughly 100 Km/h). The funny thing is that after a day or so, the problem is gone and the lights shut off and my turbo is working great again! I tried reading about online but I'd love some help with this problem. I scanned my car and here is what i got. Please let me know your thoughts!

VCDS-Lite
Windows Based VAG/VAS Emulator
Version: Release 1.0
Ross-Tech: Home
Workshop Code: 000 00000
Self-Diagnosis Log
Thursday, 18 December 2014, 20:31:28:0
VIN Number: WAULC68E52A170873 License Plate:
Mileage: Repair Order:
Chassis Type: 8E - Audi A4 B6/B7
Scan: 01,02,03,08,09,0F,11,15,16,17,18,36,37,45,46,55,56 ,57,65,67,69,75,76,77
-------------------------------------------------------------------------------
Address 01: Engine Labels: Redir Fail!
Controller: 8E0 909 518 F
Component: 1.8L R4/5VT G 0004
Coding: 0016751
Shop #: WSC 93168
3 Faults Found:
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 002 - Lower Limit Exceeded - Intermittent
18047 - Accelerator Position Sensor 1/2 (G79/G185): Implausible Signal
P1639 - 008 - Implausible Signal - Intermittent
18047 - Accelerator Position Sensor 1/2 (G79/G185): Implausible Signal
P1639 - 008 - Implausible Signal - Intermittent
Readiness: 0000 0000
-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.LBL
Controller: 8E0 927 156 P
Component: AG5 01V 1.8l5VT USA 1213
Coding: 0001002
Shop #: WSC 93204
No fault code found.
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.LBL
Controller: 8E0 614 517 A
Component: ABS/ESP allrad 1726
Coding: 04277
Shop #: WSC 06435
No fault code found.
-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.LBL
Controller: 8E0 820 043 G
Component: A4 Klimaautomat 0712
Coding: 00000
Shop #: WSC 63351
1 Fault Found:
01592 - Air Quality Sensor (G238)
30-10 - Open or Short to Plus - Intermittent
-------------------------------------------------------------------------------
VCDS-Lite
Self-Diagnosis Log
Thursday, 18 December 2014, 20:31:28:0
Page 2
VIN Number: WAULC68E52A170873 License Plate:
Address 09: Cent. Elect. Labels: 8E0-820-043.LBL
Controller:
Note: Excessive Comm Errors
-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-820-043.LBL
Controller:
Note: Excessive Comm Errors
-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-820-043.LBL
Controller: 8E0 953 549 L@@
Note: Excessive Comm Errors
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.LBL
Controller: 8E0 920 900 H
Component: KOMBI+WEGFAHRS. RB4 D25
Coding: 03300
Shop #: WSC 19411
WAULC68E52A170873 AUZ6Z0A0319652
1 Fault Found:
00562 - Sensor for Oil Level/Temperature (G266)
27-00 - Implausible Signal
-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 8E0-951-177.LBL
Controller: 8E0 951 177
Component: Innenraumueberw. 0504
Coding: 00001
Shop #: WSC 00000
No fault code found.
-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-951-177.LBL
Controller:
Note: Excessive Comm Errors
-------------------------------------------------------------------------------
Address 55: Xenon Range Labels: 4Z7-907-357.LBL
Controller: 4Z7 907 357
Component: dynamische LWR D06
Coding: 00060
Shop #: WSC 63351
No Faults Found
or DTCs not supported by controller
or a communication error ocurred
-------------------------------------------------------------------------------
VCDS-Lite
Self-Diagnosis Log
Thursday, 18 December 2014, 20:31:28:0
Page 3
VIN Number: WAULC68E52A170873 License Plate:
Address 56: Radio Labels: 8E0-035-1xx-56.LBL
Controller: 8E0 035 195 A
Component: symphony II NP2 0007
Coding: 00001
Shop #: WSC 00000
2 Faults Found:
00858 - Connection; Radio ZF Output to Antenna Amplifier
44-00 - Short Circuit
00878 - Connection to Speaker Front Left
36-10 - Open Circuit - Intermittent
End -----------------------------------------------------------------------------------------

 

Looks like your gonna need a new accelerator pedal.

 

@AudiTech616, thanks for the advice, but why do you think it's only in bad weather?