NOx system error messages

Error messages relating NOx sensor:

2AEC Nitrogen Oxide Sensor Self Diagnostics

2AF0; 2B05 nitric oxide sensor, heating

2AF2; 2B06; 2B09 nitric oxide sensor, Lambda linear

2AF4; 2B07; 2B0A NOx sensor, electrical

2AF6; 2AFB; 2B0B nitric oxide sensor, Lambda binary

2AF9 nox sensor, nox signal: coast mode check

2EAE NOx sensor message missing (timeout)

30D6 nitric oxide sensor, plausibility

30D8 NOx sensor, Sensor damaged

30DA NOx sensor, heating time

30DC nitric oxide sensor, heating

30DE NOx sensor – Lambdaprobe before catalyst, Korrelation

30E0 NOx sensor, Offset

30E2 nitric oxide sensor, thrust test

30E4 nitric oxide sensor, aging

30E6 nitric oxide sensor, dynamics


Error messages relating NOx catalytic converter:

30E9 nitric oxide catalytic converter, aging

30EA nitric oxide catalytic converter, sulphurized*

*if error appears repeatedly and/or forced desulfurization is not possible/successful


Hidden problems with NOx sensor. Following diagnostics live data:

NOx concentration is 0 ppm**

(INPA data | NOx Sensor / Exhaust temperature menu) after:

  • engine is warmed up
  • exhaust temperature is more than 220 oC
  • driving speed exceeds 20 km/h for more than 2 min

**continuously or periodically: sensor is damaged


Problems with NOx system (NOx sensor and/or NOx catalytic converter) can be the reason of following error messages:

29CC misfirings, several cylinders

29CD misfirings, cylinder 1

29CE misfirings, cylinder 2

29CF misfirings, cylinder 3

29D0 misfirings, cylinder 4

29D1 misfirings, cylinder 5

29D2 misfirings, cylinder 6

29E0 fuel mixture control

29E1 fuel mixture control 2

29F4 catalytic converter conversion

29F5 catalytic converter conversion 2

2A2B fuel mixture control

2A2C fuel mixture control 2

2C31 Lambda probe in front of catalytic converter, trimming control

2C32 Lambda probe in front of catalytic converter 2, trimming control

2C7E Lambda probe behind catalytic converter, trimming control

2C7F Lambda probe behind catalytic converter 2, trimming control




Related entries:

Performance check of NOx sensor

Stratified charge. NOx system performance evaluation