CATEngine Parts

359-9172 Nox Sensor — Cat C18

This NOx sensor is a vital part of the engine's exhaust aftertreatment system, measuring nitrogen oxide levels to optimize emissions control. It ensures the engine operates within regulatory standards by providing accurate data to the engine control module, unlike a faulty sensor that sends incorrect readings. Operators might observe a check engine light, reduced engine power, or increased exhaust emissions when this sensor malfunctions.

Nox Sensor – Part No 359-9172 – 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 TypeNOx Sensor
MaterialCeramic and Metal Alloy
ApplicationExhaust Aftertreatment System
Service LifeReplace as needed based on diagnostic codes
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

A primary symptom of a failing NOx sensor is the illumination of the check engine or emissions warning light. If ignored, the engine's performance may degrade, leading to reduced power and increased fuel consumption as the aftertreatment system struggles to function correctly. Ultimately, continued operation with a faulty sensor can lead to excessive emissions and potential engine derating or shutdown.

Installation Tip

Ensure the exhaust system is completely cool before attempting removal or installation to avoid burns. Properly torque the sensor to the manufacturer's specification to prevent exhaust leaks.

Service Note

After replacing the NOx sensor, it is often necessary to perform an electronic regeneration cycle and clear any stored diagnostic trouble codes.