2020 3.0 CEL

[mk5.Leo]

I have a recurring CEL after downloading stage 2 OTS mhd tune, any hep would be greatly appreciated
DME active codes:
12AB04 - Oxygen sensor after catalytic converter, signal: Open circuit.
12AD01 - Oxygen sensor after catalytic converter, signal: fixed at lean.
12B701 - Oxygen sensor after catalytic converter, heating: Internal resistance too high.
138102 - Exhaust flap, activation: Short circuit to ground.
21B055 - Upper radiator shutter: Internal communication fault.
21B056 - Lower radiator shutter: Internal communication fault.
CDA038 - No message (information data, cruise control, 71.7.32), receiver DME, transmitter SAS.

- DME inactive (shadow) codes:
24000B - EWS-DME interface Timeout.

- Transmission active codes:
None

- Misc. information -
4/14/2026
MHD 5.21
Adapter: UNI 3.86_3.25 (up to date)
Voltage 12.5 V
Last flash : v2.0stg291_95-1 2026.04.14
VIN: WZ1DB4C08LW031983
Factory software:
HWEL 3DDE 003_019_006
HWAP 3DD1 255_255_255
BTLD 48DC 001_016_001
SWFL 5D55 060_120_005
SWFK 6354 060_120_006

Current software:
HWEL 3DDE 003_019_006
HWAP 3DD1 255_255_255
BTLD 48DC 001_016_001
SWFL 5D55 060_140_005
SWFK 6354 060_140_053
CAFD 2742 000_171_026
Current PRG (hex): 5D553C8C05
ECU build date: 2019.11.01

ECU status: -

- Readiness -
Misfire: Complete.
Fuel System: Complete.
Components: Complete.
Catalyst: Not avail.
Heated Catalyst: Not avail.
Evaporative System: Complete.
Secondary Air System: Not avail.
A/C Refrigerant: Not avail.
Oxygen Sensor: INCOMPLETE.
Oxygen Sensor Heater: Complete.
EGR System: Complete.

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