Error with new car with Nox? or Adblue?

[mstar]

[COLOR=var(--primary-text)]Apologies if this was answered elsewhere.... tried searching but to no avail. I am desperate for help to try and understand what part this maybe causing this error (added other info FYI). Any help be a great help and appreciated. Researching this tells me could be NOX sensor, o2 sensor but don't want to throw parts blindly.

ERROR: 17277 (P20EE) – SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 1

Freeze frame

Priority: 2

Malfunction frequency counter: 1

Unlearning counter: 255

Date: 08 Aug 2024 12:22:07 pm

Engine rpm: 1572.50 RPM

Normed load value: 81.6 %

Vehicle speed: 51.0 km/h

Coolant temperature: 90 °C

Intake air temperature: 32 °C

Ambient air pressure: 1000 mbar

Voltage terminal 30: 12.620 V




Car: 2015 A6 Allroad 3.0TDI 272.

I research this and it could be a variety of things, just not sure where to start. I rang a garage and they said "most times its the NOX sensor" just thinking if thats usually the cause NO other error on dash etc. I used Carista diagnostics machine and it comes in the Engine Checks (Error 17277) and OBD checks as P20EE.

[dean warren]

Sometimes the injection port blocks with crystals on the adblu could be worth checking and cleaning


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[mstar]

Sometimes the injection port blocks with crystals on the adblu could be worth checking and cleaning


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Thanks dean this be worth doing first i guess. Did you mean the adblue injector? the one which pumps adblue into the system to lower emissions?

Also would these not clear up themselves or really its a manual job? got i wish i never got a adblue car lol

[dean warren]

Yeah where the injector goes into the exhaust, and no if they block up they wont self clear,
You might need a metal pick, some bake cleaner and or DPF cleaner, if it is blocked try not to push it into the exhaust get out what you can.


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