CATEngine Parts

591-3429 Diesel Exhaust Fluid Level Sensor — Cat 320 315

This Diesel Exhaust Fluid (DEF) Level Sensor is integral to the Selective Catalytic Reduction (SCR) system, monitoring the quantity of DEF in the tank. It ensures the SCR system has sufficient DEF to effectively reduce harmful NOx emissions from the exhaust. A malfunctioning sensor can lead to inaccurate DEF level readings, potentially disabling the SCR system and causing the engine to derate or shut down due to emissions compliance requirements.

Diesel Exhaust Fluid Level Sensor – Part No 591-3429 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeDEF Level Sensor
MaterialCorrosion-resistant plastic and electronics
ApplicationDEF tank monitoring
Service LifeReplace if DEF level reading is inaccurate
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common symptom of a failing DEF level sensor is an incorrect or fluctuating DEF level displayed on the instrument panel. The system may also trigger a DEF level warning light or message, even if the tank is full. If the issue persists, the SCR system may become inactive, leading to engine power reduction (derate) to comply with emissions regulations.

Installation Tip

Ensure the DEF tank is clean and free of any contaminants before installing the new sensor. Do not force the sensor into place; it should seat smoothly with proper alignment.

Service Note

Inspect the DEF tank for sediment and clean the DEF lines if the sensor replacement is due to persistent DEF system faults.