Hello folks,

I'm the new owner of a used Kodiaq, first registration 2022 , 2.0 TDI 147kw ( 200 CP ) 4x4 - DTUA engine - 163 k km on the clock

After 1 km of driving I got the MIL ON check engine light , upon scanning with VCDS I got 2 faults:

1. Particale Matter sensor - Electrical fault

2. NOx Sensor Bank 1 Sensor 3 - Implausible siglan

Cleared the errors, after 1-2 km of driving I got the check engine light again, now only the PM sensor - Electrical fault error appeared.

I went ahead and ordered a new PM sensor and replaced it and cleared the warnings. everything worked fine for about 20 km, then the Check Engine light came up again, upon testing I got 2 errors:

1. NOx Sensor Bank 1 Sensor 3 - Implausible Signal ( P23AD 00 )

2. SCR NOx Catalyst Bank 1 - Efficiency too low ( P20EE 00 )

Currently I cleared the erorrs and nothing new came up for about 10-15 km, but I am expecting to have the same error again.

Anyone knows where this sensor is located exactly? I think it's the one located right next to the Particle Matter sensor on the exhaust . If that's so, the sensor code is 05L 907 807 AH. Does anyone know if 05L 907 807 CB or any other termination works? The new sensor looks the same, it's still made by Bosch .

Thank you,

Madalin

I don't know if it is the correct sensor for that fault code, but this link suggests that suffix CH is equivalent to the -AH.

See here https://www.skoda-parts.com/spare-part/05l907807ch-nox-sensor-skoda-54223.html

Thank you, @Breezy_Pete ,

I found the above mentioned sensor (termination CB ) at a fraction of the price ( ~200 euro ) , coming off a new car (0 km ) which was in an accident during transport, I'm waiting to see if anyone else knows if these 2 are interchangeble or not. In the end, without a clear answer I will go ahead and order the AH/CH sensor.

Cheers.

Quick update: That is the sensor in question, I crawled under the car today and disconnected it and scanned it with VCDS and now I have NOx Bank 1 Sensor 3 No Communication, after reconnecting the sensor, everything is fine.

I will let you know once I change it with the CB sensor

Hi,

Does this mean that disconnecting the sensor made a hard reset that cleared your fault code?

Hi @Bap33 ,

No, disconnecting the sensor triggered a new error - No communication with NOx sensor bank 1 sensor 3 , basically confirming the physical location of the sensor.

Initially the error was implausible signal and it was intermittent, triggering every other 2 days , I didnt know which sensor to buy ( without going to the dealership and pay a premium on the part + labor + diagnosing the car ) . So in order to phyisically locate the sensor I did the following:

1. Cleared all the errors on the car with VCDS ( but anyother good tester should work fine )

2. Went underneath the car and disconnected the sensor which I thought it is faulty

3. With the sensor disconnected I started the car and scanned for DTCs

4. now you have 2 options:

   a. If you disconnected the correct sensor, you would have the same error name but with a new description ( no communication - instead of - implausible signal )

   b. If you disconnected another sensor, you would have another error; example : Particle Matter sensor - no communication - this means that you disconnected another sensor so you should plug it bag, clear the errors and then disconnect another sensor, until you get it right. Of course, first you have to do some digging and narrow down the area where the sensor is located.

   hopefully I answered your question, I do apologize for my English, it's not my first language.

14 hours ago, MadalinT said:

hopefully I answered your question, I do apologize for my English, it's not my first language.

No worry English isn’t my mother tongue either 😁.

I clearly for you this time. 😉👍