Introducing the New DEF Level Sensor — OE 23539939 / 24383068

Our newly released DEF (Diesel Exhaust Fluid) level sensor is a high-precision, direct-fit replacement designed for the most popular heavy-duty diesel platforms on the road today. Featuring OE reference numbers 23539939 and 24383068, this sensor restores accurate DEF monitoring and keeps SCR-equipped trucks running at full power.

As emission regulations tighten across Europe, North America and beyond, SCR and DEF systems have become standard on virtually every modern commercial diesel. That makes reliable DEF components — and especially the DEF level sensor — an indispensable part of any truck aftermarket catalogue.

The Critical Role of the DEF Level Sensor

The DEF level sensor is the "eyes" of the Selective Catalytic Reduction (SCR) system. Mounted inside the DEF tank, it continuously measures fluid level and temperature, then relays that data to the engine control unit (ECU). When it works correctly, the system can dose DEF precisely, keep NOx emissions within legal limits and protect the catalyst from damage. When it fails, the consequences are serious:

• Illuminated "Check DEF" or "Low DEF" warning lights
• Engine derate (reduced power) and road-speed limitation
• Increased emissions and failed roadside inspections
• Urea scaling and crystallisation that can damage the SCR catalyst
• Potential no-start condition that sidelines a working truck

Because a single failed sensor can ground an entire vehicle, choosing a reliable replacement is far more cost-effective than risking costly downtime.

Applications and Vehicle Fitment

This new sensor is built to serve a broad range of North American and global trucks. It is a direct replacement for:

Product Highlights

• Direct-fit replacement — no modification required
• OE-comparable fit, form and function
• Durable construction resistant to urea corrosion
• Accurate level and temperature readings
• Stable performance across wide temperature ranges
• Ideal for wholesale and fleet maintenance programmes

Engineered for Reliability

Every unit is manufactured under strict quality control, using corrosion-resistant materials engineered to withstand the harsh chemistry of Diesel Exhaust Fluid. Each sensor is tested for signal accuracy and seal integrity before shipping, helping installers deliver a repair that lasts.

Order Today

With fleets facing strict emission standards, maintaining a dependable DEF sensor supply is essential. Our new DEF level sensor (OE 23539939 / 24383068) is available now for wholesale orders, with competitive pricing and reliable lead times. Whether you serve long-haul fleets, regional distributors or repair shops, stocking this sensor keeps your customers moving with minimal downtime. Contact our sales team to request samples, quotations or the full fitment list for your market.