Hello, for some time now I have been getting an error related to the NOx sensor on a Skoda Superb 2.0 TDI DFGA. I am attaching the log file from VCDS.

Address 01: Engine (J623-DFGA)       Labels:. 04L-907-309-V1.clb
   Part No SW: 04L 906 026 KD    HW: 04L 907 309 P
   Component: R4 2.0l TDI   H25 4798  
   Revision: B4H25---    CVN: D1E41DF1B866C2ADB866C2AD
   Coding: 02250412036405087000
   Shop #: WSC 01286 386 08256
   ASAM Dataset: EV_ECM20TDI01104L906026KD 005005
   ROD: EV_ECM20TDI01104L906026KD_005_SK48.rod
   VCID: 76E353DFC9C73423E9-8022
   VINID: 91D49A6077A005A1C508724814E014185C

2 Faults Found:
9582 - NOx Sensor 1 Bank 1 
          P2200 00 [096] - Electrical Malfunction
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 168211 km
                    Date: 2025.01.04
                    Time: 15:11:49

                    Engine RPM: 1880.50 /min
                    Normed load value: 65.5 %
                    Vehicle speed: 124 km/h
                    Coolant temperature: 90  C
                    Intake air temperature: 88  C
                    Ambient air pressure: 930 mbar
                    Voltage terminal 30: 14.580 V
                    Unlearning counter according OBD: 40
                    Engine status: COENG_RUNNING
                    Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

9879 - Sense Circuit for Heater for NOx Sensor 1 Bank 1 
          P2209 00 [237] - Implausible Signal
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 168014 km
                    Date: 2025.01.04
                    Time: 10:03:13

                    Engine RPM: 1949.50 /min
                    Normed load value: 74.1 %
                    Vehicle speed: 60 km/h
                    Coolant temperature: 45  C
                    Intake air temperature: 67  C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 14.800 V
                    Unlearning counter according OBD: 40
                    NOx sens.dwnstrm.SCR cat conv: NOx conc.: 0 ppm
                    NOx sensor before SCR cat conv: NOx concentration: -100 ppm
                    NOx sens. dwnstrm. of SCR cat.: target heat. temp reached-Bits 0-7: 0
                    NOx sensor after SCR catalytic converter: supply voltage: 0 mV
                    NOx sensor before SCR catalytic converter: supply voltage: 14560 mV
                    Outside temperature sensor 1: B1: raw value: 3.5  C
                    Mean injection quantity: 34.82 mg/stroke

Readiness: 1 1 0 0 0 

-------------------------------------------------------------------------------

 

I kindly ask for your assistance in determining what might be causing this.

 

 

Scan-TMBJH7NP1J7527985-20250111-1740-168222km-104528mi.txt

Edited 11 January, 20251 yr by plamen_333

it's likely the NOx sensor that needs replaced, they are expensive to buy

the best option is to get it coded out, usually along with a remap

it will save you buying adblue, so depending on the mileage you do, you might get a fair bit of the remap cost back but more importantly no more adblue problems  😀 

@310golfr Thank you ! 

Please provide me with information so I can try unplugging the socket and plugging it back in.

Please provide me with information on coding.

NOx sensor 1 is the front sensor near the engine , NOx sensor 2 is on the exhaust near the back of the car.

if you get them coded out they will both be disconnected,

you need to go to a remap /tuning specialist unless you want to replace the sensor

@plamen_333 , how did you fixed the problem because it appeared that I have exactly the same issue at the moment with P2200 Error Nox sensor circuit bank 1

Hello @iv3-skoda,

 

Thank you for your question. Unfortunately, I haven't found a permanent solution to the problem yet. Here's what I can share from my experience:

 

1. In my case, the error appears rarely, usually during highway driving.

2. I use VCDS for diagnostics and periodically clearing the error code.

3. Since I mainly use the car for highway trips and not very often, this temporary solution with VCDS works for me for now.

4. I'm still considering whether to take more serious steps such as replacing the sensor, consulting a specialist for possible coding, or disabling the AdBlue system.

 

If you have VCDS or a similar diagnostic tool, you can monitor the sensor's behavior in more detail and clear the errors when needed.

 

If you decide to take any action before I do, I'd be glad if you could share the result.

 

I hope this information is helpful to you. Good luck with resolving the problem!

 

Edited 25 February, 20251 yr by plamen_333

@plamen_333, I've actually cleared the error couple of times but it re-appreares almost immediately (last time when I was <10km away from home) which is quite annoying. Today I checked which NOx sensor will work (according to VIN of the car) and it seem that there is a (I hope) a permanent solution if it is replaced with https://nasauto.bg/nox-senzor-nox-katalizator-pr1292978007.html for example. 

I will order the part later today and will share more details about it once it is replaced. 

 

Thanks for you input! 

Thank you for the information, @iv3-skoda. I appreciate you sharing this with us.

 

It's interesting that the error reappears so quickly for you. This definitely suggests a more serious problem than what I'm experiencing.

 

The link you provided for the replacement NOx sensor looks promising. I'm glad you've found a potential permanent solution. It will be very helpful to hear about your results after you replace the part.

 

Please keep us informed about how the replacement goes and whether it solves the problem. Your experience could be valuable for others facing similar issues, including myself if I decide to take further action in the future.

 

Good luck with the replacement, and I look forward to hearing about the outcome!

 

By the way, are you from Bulgaria? It would be great if we're fellow countrymen and could share experiences at a local level.

Sure! Yup, I live in Bulgaria (close to Sofia actually) and will appreciate if you share a good service (or person) that takes care of your personal car  thanks in advance!

@iv3-skoda I sent you a private message.

Hello guys!

I'm facing the same problem with a Skoda Superb III 2019, 2.0 DSG 4X4 190hp. Didn't know at the beginning with be long lasting issue. It appears from the firt 40.000km, and now at I'm at 190.000. No loss power or something, just the error.

Hello @Marioo, which error code appears in your case - P2200 (NOx Sensor 1 Bank 1 electrical malfunction) or P2209 (sensor heating circuit issue), or both? Also, could you share how often you need to clear these errors and whether they reappear immediately after clearing or it takes some time?

Is P2200

2-3 days, depends

Thank you for your response, @Marioo . So you're only getting the P2200 error (NOx sensor electrical malfunction) and it returns every 2-3 days. This is different from some other cases where the error reappears almost immediately after clearing. Are you using any diagnostic software to clear the errors?

Edited 27 March, 20251 yr by plamen_333

Yes, MiniOBD II. I didn't use any software until now to clear the eror, only at Skoda every 10000 when I was changing the oil.

Sometimes, the error disappeared by itself. But rarely

Probably changing the sensor is the key for a while, the thing is, If you drive in the city the error will come back

I don't know where we can find the best price for this

I've seen on YouTube, they clean the sensor with radiator cleaner. What do you think?

While cleaning the NOx sensor with radiator cleaner has been shown in some YouTube videos, I would be cautious about this approach. NOx sensors are very sensitive electronic components and using harsh chemicals could potentially damage them further. If you want to try cleaning, I would first recommend checking if there's any visible debris or deposits that could be carefully removed. However, given that this is a critical emissions component, the safest options remain either proper replacement with a new sensor or having it professionally serviced. Have you had any professional diagnose the sensor condition?

I don't know how is sounds, but I don't trust the guys from Škoda. What I mean, they won't try to clean it, is easier to replace it.

As long as I need to replace it, I think is a good option, trying to clean it first.

Also, when I reset the error, the car automatically starts regenerating the particle filter.

Edited 27 March, 20251 yr by Marioo

Interesting, in my case the regeneration doesn't start automatically after clearing the error as you mentioned. This might indicate that we have different software versions or that our NOx sensor issues are slightly different, even though the error code is the same. Please share your results after cleaning the sensor - it would be very helpful to know if this approach works. This information could help other owners facing the same NOx sensor issue, especially given the high replacement costs at official dealers.

Speaking from my perspective and experience the cleaning didn't helped much - the error reappeared shortly after. So as I already mentioned there weren't any side effects (at least to my knowledge) but the check engine light was quite disturbing so I decided to replace the NOx sensor. I bought it from a local car parts seller for ~275 euro and after the replacement everything was fine. :) I can share more details if you want to

Thank you for sharing your experience, @iv3-skoda It's interesting to hear that cleaning the sensor didn't help in your case and that the error reappeared shortly after. I understand that this was quite frustrating for you, as the check engine light was quite disturbing. I'm glad you found a solution by purchasing a new sensor from a local car parts seller for around 275 euros. I'm happy to hear that everything is fine after the replacement. If you're willing, you can share more details about your experience, which could help other users with a similar problem.

so, at the end, replacing the sensor is the solution

Also I found a repair kit
https://www.aliexpress.com/w/wholesale-nox-sensor-repair-kit.html?spm=a2g0o.detail.search.0