Fitment:
Compatible with Volvo VNL and Mack Anthem platforms using SCR emission systems.
OEM reference numbers: 22303390, 21479638, 21567764.
Used in diesel exhaust aftertreatment system for NOx monitoring (SCR system).
Typically installed in inlet or outlet position depending on engine and emission configuration.
Fitment must be confirmed by OEM part number and engine/emission system setup before installation.

FAQ:

Q1: How do I confirm compatibility?
A1: Match OEM numbers 22303390, 21479638, or 21567764 with your original sensor and verify connector type and wiring length.

Q2: Where is this NOx sensor installed?
A2: It is used in the SCR system of Volvo and Mack trucks and can be installed before or after the catalytic converter depending on configuration.

Q3: What are common failure symptoms?
A3: Engine warning light, SCR/DEF system fault, incorrect NOx readings, or reduced engine performance.

Q4: Are these part numbers interchangeable?
A4: These numbers are cross-referenced variants used across Volvo and Mack platforms depending on application.

Q5: Does replacement require programming?
A5: Some vehicles require system reset or diagnostic adaptation after installation.