Fitment
Compatible with Euro 6 diesel emission systems

Vehicle applications include:
Peugeot Boxer
Citroën Relay
Fiat Ducato
Other PSA / Fiat group vehicles using part number 9821120780

FAQ

Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide concentration in diesel exhaust to support SCR urea dosing control.

Q2: Where is this sensor installed?
A2: It is installed in the exhaust aftertreatment system, typically upstream or downstream of the SCR catalyst.

Q3: Is part number matching required?
A3: Yes, exact OEM part number 9821120780 is required for correct fitment.

Q4: Are Boxer III and Relay III using the same sensor?
A4: Yes, they share the same PSA platform and emission system components in many configurations.

Q5: What are common failure symptoms?
A5: Engine warning light, AdBlue system faults, NOx sensor error codes, or reduced engine performance mode.