Detroit Diesel Inlet NOx Sensor - Skyline SNX114 OE - A0121536328

• OE Manufactured Quality: Built by Skyline to strict Original Equipment specifications, ensuring the exact factory calibration, rapid heating element response time, and durability your Detroit ECU demands.
• Prevents Costly Derates: Accurately measures upstream nitrogen oxide levels to establish an emissions baseline, preventing false readings that trigger dreaded DEF faults and severe Limp Mode derates.
• Extreme Heat Resistance: Features an advanced ceramic sensing element and robust heat shielding specifically designed to survive the brutal, raw exhaust gas temperatures leaving your engine block.
• Direct Plug-and-Play Fit: Arrives fully pre-wired with the correct factory connector to seamlessly replace Detroit Diesel A0121536328 and A0111536128 without complex splicing or harness modifications.
• Reduces Shop Comebacks: Swapping out a fouled OEM sensor with this high-quality, fleet-standard replacement ensures reliable, long-term DEF dosing calculations to keep your truck moving.

Restore your engine's power and eliminate persistent aftertreatment codes with this premium Detroit Diesel Inlet NOx Sensor by FleetPro Parts & Tires. Manufactured by Skyline to strict Original Equipment (OE) standards, this upstream Nitrogen Oxide sensor continuously monitors the raw exhaust gases leaving your engine before they enter the SCR system. A fouled inlet NOx sensor will trigger the check engine light, cause poor fuel economy, and eventually force your truck into a severe Limp Mode derate. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel shops, and owner-operators nationwide.

Clear DEF Codes: The Detroit Diesel Inlet NOx Sensor Advantage

This Detroit Diesel Inlet NOx Sensor is engineered to deliver highly accurate, real-time emissions baseline data directly to your engine control unit (ECU). Mounted upstream (at the inlet) of the SCR catalyst, it allows the ECU to calculate the precise amount of Diesel Exhaust Fluid (DEF) required to neutralize harmful nitrogen oxide gases. Built to withstand brutal pre-treatment exhaust temperatures, extreme vibration, and heavy soot buildup, this Skyline sensor guarantees OE-level response times and unmatched durability.

As we continue to build the largest inventory of commercial truck parts in Illinois, we prioritize aftertreatment electronics that eliminate diagnostic headaches and rework. Serving as a direct exact-fit replacement for heavily searched Detroit Diesel OEM numbers like A0121536328 and A0111536128, this sensor plugs directly into your factory wiring harness without complex splicing. Upgrade your emissions system today with a reliable, guaranteed-to-fit sensor that keeps your truck out of the shop and out on the road.

Vehicle Fitment & Compatibility

This OE-quality Skyline nitrogen oxide sensor is precision-engineered for the following heavy-duty exhaust applications:

• Engine Make: Detroit Diesel
• Exhaust Position: Inlet / Upstream (Pre-SCR Catalyst)
• Component Function: Baseline Nitrogen Oxide (NOx) Emissions Monitoring

Direct Replacement & Cross-Reference Numbers:

This upstream NOx sensor serves as a direct exact-fit replacement for the following part numbers:

• Skyline: SNX114
• Detroit Diesel OEM: A0121536328, EA0121536328, RA0121536328, A0111536128, EA0111536128, RA0111536128
• Aftermarket Interchange: 3FL022

Technical Specifications

• Sensor Type: Nitrogen Oxide (NOx) Sensor
• Mounting Location: Inlet (Upstream)
• Product Level: OE Manufactured
• Brand: Skyline (Distributed by FleetPro Parts & Tires)