Volvo NOx Sensor 22303390 5WK97367, applicable to diesel engines for China IV and China V

When your Volvo diesel engine shows check engine light on, acceleration weakness, increased fuel consumption, or dashboard indicates “Engine system needs service,” it usually means NOx sensor has aged or failed and cannot accurately monitor NOx in exhaust. Properly functioning sensor real-time feedback of oxygen content to ECU helps control urea dosing, ensuring efficient combustion under Euro 4/Euro 5 and reducing harmful emissions. OEM number 22303390, corresponding to 5WK97367 and 5WK9 6644; compatible with various diesel engines. Install only after engine cools to avoid thread damage; also route sensor harness away from exhaust or moving parts; after installation, use a diagnostic tool to clear fault codes and perform adaptive learning.