A nitrous oxide sensor, or, as it is more commonly known, a NOx sensor, is a device in automobiles which is designed to detect nitrogen oxide. It uses a lambda probe in the exhaust to measure how much oxygen is present, feeding this information back to the engine management system.
Unfortunately, over time, NOx sensors can malfunction, leading to a range of problems in your vehicle, including reduced power, acceleration and performance.
If ignored, the problem could worsen, potentially costing you thousands of pounds to fix.
In this blog, we'll run through some of the most common Mercedes-Benz NOx sensor issues and how you should go about fixing them.

P2022 code

A P2022 is a diagnostic trouble code which usually indicates that your Merc has a damaged or defective NOx sensor. It can be simply caused by road debris, such as ice or snow, blocking the sensor, so check your vehicle first before taking it to a professional. Some common symptoms of a vehicle which has a NOx sensor displaying this code include the check engine light being illuminated, excessive smoke from the exhaust and inconsistent fuel economy.

P229F62 P229F

This is another diagnostic P229F62 or P229F code which indicates a faulty NOx sensor. This usually means that your Nitrogen Oxide (NOx) Sensor Bank 2 is faulty, open or shorted, or has a poor electrical connection. Again, a symptom of this fault can be your engine warning light suddenly coming on. In both instances of these diagnostic codes showing up, you may need to replace your NOx sensor.

U029D/U029E

These codes indicate that the NOx sensor A (for U029D) or B (U029E) is not communicating with the other control modules in your Mercedes. The most common reason for failure is a circuit fault. If you experience this issue, you
should get it checked out as soon as possible, as the PCM will no longer be able to check emission levels.

U029D and U029E explained:

  • U029E00 Lost communication with NOX sensor B
  • U029E Lost communication with NOX sensor B
  • U029D00 Lost communication with NOX sensor A
  • U029D Lost communication with NOX sensor A

Other Mercedes-Benz Sprinter Vito Viano fault codes:

  • P229f09 - Nox sensor 2 cylinder bank 1 has a malfunction there is a component fault
  • P229f28 - Nox sensor2 cylinder bank 1 has malfunction
  • P229F62 Signal of NOx sensor implausible
  • P229F62 - The signal of component NOx sensor is implausible. The following test procedure must always be performed in its entirety
  • P229F-62 P229F62 NOx sensor 2 (cylinder bank 1) has a malfunction. The signal comparison is faulty
  • P220F77 - The heater of NOx sensor 2 (cylinder bank 1) has an electrical fault. The commanded
    position cannot be reached
  • P229E11 - NOx sensor 2 (cylinder bank 1) has an electrical fault. There is a short circuit to ground
  • P229FFB NOx sensor 2 has malfunction
  • P229F85 P229F-85 NOx Sensor 2 (Cylinder Bank 1) Has A Malfunction. There Is A Signal Above The Permissible Limit Value
  • P229F - Nitrogen Oxides (NOx) sensor 2, bank 1 - circuit range/performance
  • P13D-F09 The AdBlue system has a malfunction. There is a component fault.
  • P229F-62 NOx sensor 2 (cylinder bank 1) has a malfunction. The Signal Comparison is faulty
  • P229F-09 NOx sensor 2 (cylinder bank 1) has a malfunction. There is component fault.
  • P220400 the nox sensor (cylinder bank 1) has a sporadic malfunction._
  • P220000 the nox sensor (cylinder bank1) has an electrical fault._
  • P220E77
  • P220011
  • P229FE1 P229F(E1) Nitrogen oxides (NOx) sensor 2, bank 1 - circuit range/performance
  • P220A0(16) Nitrogen oxides (NOx) sensor 2, bank 1 - circuit low
  • P229E(11) Nitrogen oxides (NOx) sensor 2, bank 1 - circuit malfunction
  • P22A0 Nitrogen oxides (NOx) sensor 2, bank 1 - circuit low
  • P2200
  • P2201
  • P2201-62 NOx sensor (cylinder bank 1) has a malfunction. The signal comparison is faulty.
  • P220162
  • P2202 - NOx Sensor Circuit Low Bank 1
  • P2203-00 - NOx Sensor 1 Bank 1 Signal too High
  • P2204
  • P2214 - NOx Sensor Circuit Range/Performance Bank 2
  • P22A021 - NOx sensor 2 (cylinder bank 1) has a short circuit to ground. The signal amplitude is less than the minimum amplitude
  • P2202, P229F - Fehlercode
  • P220013 - The NOx sensor 1 (cylinder bank1) has an electrical fault. There is an open circuit.
  • P220108 The NOx sensor (cylinder bank 1) has a malfunction. There is a signal fault or the message is faulty.
  • P221408 The NOx sensor (cylinder bank 2) has a malfunction. There is a signal fault or the message is faulty.
  • P221401 Nox sensor cylinder bank 2 malfunction.
  • P22A1-22 P22A122 NOx sensor 2(cylinder bank1) has a short circuit to positive. The signal amplitude is greater than the maximum amplitude.
  • P229F-23 P229F23 NOx sensor 2(cylinder bank1) has a malfunction. No signal change: voltage level is too low.
  • P13DF00 The AdBlue system has a malfunction
  • P2BA9FD The emision limit for the NOx concentration has been exceed (AdBlue quality is too low)
  • P229E13 P229E-13 NOx sensor 2 (cylinder bank 1) has an electrical fault. There is an open circuit

Contact Us

Experienced any of the above? Get in touch with us: we provide a range of replacement Mercedes-Benz NOx sensors for a number of models - such as the Sprinter W906, W222, W205 S205, W212, S212, A207, C207 and W166 - if yours is faulty.