Hi I have a 2006 A4 B7 2.0T Quattro with 77k miles on it. I put an APR cold air intake on it about 4 months ago and got the APR 93 octane ECU tune about 5 weeks ago. 2 weeks ago my check engine light came on. I read the code. It is the first one I have listed below. I sent the codes to APR and the place that I got it tuned at. They both said it is most likely the diverter valve.

Well I just had the diverter valve replaced with the ECS valve. Then a few days after I had it replaced the check engine light came on again. The codes are the second log listed.

Both said boost pressure regulation: control range not reached. This makes me think there is a leak somewhere. I sent this to APR and they said there could be a leak in the EVAP system. Does anyone know where the EVAP system is on the car? How hard is it to replace? Do you even think it is the EVAP system? Could it be something else? Thanks for any help.


FIRST CHECK ENGINE LIGHT
Wednesday,03,August,2011,21:55:36:28064
VCDS Version: Release 10.6.4 (x64)

Address 01: Engine Labels: 06F-907-115-AXX.lbl
Control Module Part Number: 8E0 910 115 M HW: 8E0 907 115 D
Component and/or Version: 2.0l R4/4V TFSI 0070
Software Coding: 0104010A180F0120
Work Shop Code: WSC 24102 444 84538
VCID: 2B5E97A5F395
1 Fault Found:

000665 - Boost Pressure Regulation: Control Range Not Reached
P0299 - 002 - Lower Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Mileage: 123119 km
Time Indication: 0

Freeze Frame:
RPM: 2647 /min
Load: 88.6 %
Speed: 98.0 km/h
Temperature: 82.0°C
Temperature: 38.0°C
Absolute Pres.: 980.0 mbar
Voltage: 13.716 V


Readiness: 0000 0000
-----------------------------------------------------------
SECOND CHECK ENGINE LIGHT

Tuesday,31,August,2010,20:36:20:28064
VCDS Version: Release 10.6.0 (x64)
Data version: 20100630

Mode 07: Pending emission related fault codes

Address 10 (Engine): 2 Faults Found:
P0300 - Random/Multiple Cylinder Misfire Detected
P0446 - SAE - Evap System Vent Control Circuit Malfunction

Thursday,18,August,2011,17:24:32:28064
VCDS Version: Release 10.6.4 (x64)
Data version: 20110418




Address 01: Engine Labels: 06F-907-115-AXX.lbl
Control Module Part Number: 8E0 910 115 M HW: 8E0 907 115 D
Component and/or Version: 2.0l R4/4V TFSI 0070
Software Coding: 0104010A180F0120
Work Shop Code: WSC 24102 444 84538
VCID: 2B5E97A5F395
1 Fault Found:

000665 - Boost Pressure Regulation: Control Range Not Reached
P0299 - 002 - Lower Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Mileage: 123648 km
Time Indication: 0

Freeze Frame:
RPM: 5301 /min
Load: 94.1 %
Speed: 115.0 km/h
Temperature: 87.0°C
Temperature: 39.0°C
Absolute Pres.: 980.0 mbar
Voltage: 13.462 V


Readiness: 0000 0000