Bad diverter valve?

[Aigoo]

got me a check engine light!

1 Fault Found:
000665 - Boost Pressure Regulation
P0299 - 000 - Control Range Not Reached - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 35675 km
Time Indication: 0
Date: 2026.14.17
Time: 15:45:03

Freeze Frame:
RPM: 3520 /min
Load: 89.0 %
Speed: 94.0 km/h
Temperature: 97.0°C
Temperature: 41.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 13.716 V

ive looked it up and all signs point to the diverter valve. should i even bother going to my dealership (which i dont have the nicest relationship with since stage 1) or should i just change the diverter valve myself?

I've also have this random code i can't figure out if anyone wants to take a crack. searching showed no real answer.

Address 17: Instruments (J285) Labels: 5K0-920-xxx-17.clb
Part No SW: 5K6 920 970 H HW: 5K6 920 970 H
Component: KOMBI H03 0305
Serial number: 00000000000000
Coding: 270F00
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04052
ROD: EV_Kombi_UDS_VDD_RM09_VW36.rod
VCID: 3957F098B842B31

1 Fault Found:
12658432 - Function Restricted due to Missing Message(s)
U1111 00 [009] - -
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 254
Mileage: 34618 km
Date: 2025.14.26
Time: 17:18:33


Thanks!

 

[Killswitch24]

Ignore the second fault.

P0299 is not as common on the TSI as they were on the FSI. It's possible that it's a bad DV, but not the only possible fault. P0299 just means that boost is lower than commanded. Do you have the old rubber diaphragm style DV? It's easy to remove and check for tears (I've also found them seized open). The fault indicates only 1 occurrence, have you cleared it to see if it returns or have you run any boost spec/actual logs?

 

[Aigoo]

I'll clear the code to see if it returns. No logs have been done/haven't checked my dv yet. I don't want to pull it out and have the dealer give me shit about pulling the DV haha.

You think they'll deny warranty based on the flash?

Ignore the second fault.

P0299 is not as common on the TSI as they were on the FSI. It's possible that it's a bad DV, but not the only possible fault. P0299 just means that boost is lower than commanded. Do you have the old rubber diaphragm style DV? It's easy to remove and check for tears (I've also found them seized open). The fault indicates only 1 occurrence, have you cleared it to see if it returns or have you run any boost spec/actual logs?