GPD 1815170 Downstream Nitrogen Oxide NOx Sensor Direct Fit

The GPD 1815170 is a direct-fit aftermarket Nitrogen Oxide (NOx) Sensor from Global Parts Distributors (GPD), engineered to meet or exceed OEM fit, form, and function. This downstream NOx sensor is a critical component of your vehicle's diesel emissions aftertreatment system, monitoring nitrogen oxide concentrations in the exhaust stream exiting the Selective Catalytic Reduction (SCR) catalyst.

The sensor continuously transmits real-time NOx level data to the engine control unit (ECU), enabling the system to regulate DEF (Diesel Exhaust Fluid) injection and ensure the SCR system is performing within compliance thresholds. A failed or degraded NOx sensor can trigger check engine lights, DTC fault codes, and in severe cases, engine derate (limp mode).

Key Features:

• Direct-fit replacement — no modification required
• Downstream (post-SCR) sensor position
• Designed to meet or exceed OEM specifications
• Durability tested on every new design
• Helps maintain emissions compliance and prevent engine derate
• From GPD — a trusted national distributor of aftermarket engine management and HVAC parts since 1974

GPD (Global Parts Distributors, LLC) has been supplying high-quality aftermarket automotive and heavy-duty parts since 1974, with multiple distribution warehouses serving customers across the USA. The GPD 1815170 NOx sensor is part of their expanding engine management sensor line, backed by GPD's commitment to quality and customer service.