Application & Function — The World American WA912-19-8216 NOx sensor monitors nitrogen oxide concentration in diesel exhaust to provide critical feedback to the SCR aftertreatment system. Built for Detroit Diesel/Freightliner applications, it features a 23.88 in harness and a 4‑pin connector for OE‑style hookup. Accurate NOx measurement supports emissions compliance, stable dosing control, and faster root‑cause diagnosis of aftertreatment faults. Core identifiers: WA912-19-8216; UPC 00643553129196.

Compatibility & Cross‑References — Direct replacement for Detroit Diesel references A0091530628 and A0101532228, including EA/RA service variants, and Freightliner DDE equivalents (e.g., DDE A0101532228, DDE A0101532228EA, DDE A0101532228RA). Additional aftermarket cross‑references include Global Parts 1815152/1815196, Walker 285‑1013, Automann 577.468/577.46800, and comparable listings such as 5WK9 7338A and Redline Emissions Products S11228. The OE‑style probe and connector support straightforward installation in the factory sensor location, while the harness length accommodates typical routing from the exhaust stream to the control module. Designed for heavy‑duty service environments, the assembly helps maintain reliable emissions monitoring over the service interval. Proposition 65: Warning—Cancer and Reproductive Harm.

Service Notes — Confirm correct sensor position (upstream vs downstream) per OE documentation before installation. Inspect connector terminals for corrosion and route the cable away from sharp edges and high‑heat sources. After replacement, clear stored DTCs and perform any OEM‑required NOx sensor or SCR adaptation procedures to ensure proper closed‑loop dosing control.