CATEngine Parts

359-9171 Nox Sensor — Cat C18

This is a precise NOx (Nitrogen Oxide) sensor, an essential component of the engine's exhaust aftertreatment system. It accurately measures the level of nitrogen oxides in the exhaust gases, providing critical data to the engine control module (ECM) for emissions regulation. Unlike a faulty sensor that provides incorrect readings, this sensor ensures the ECM can properly manage the aftertreatment system, preventing excessive emissions and potential engine derating. Operators may notice an illuminated check engine light, reduced engine power, or increased exhaust emissions when this sensor fails.

Nox Sensor – Part No 359-9171 – 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, metal alloys
ApplicationExhaust Aftertreatment System
Service LifeReplace as needed based on diagnostics
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The primary symptom of a failing NOx sensor is the illumination of the engine's check engine or emissions warning light. This can be followed by a noticeable decrease in engine power or performance as the ECM attempts to compensate for incorrect sensor readings. If left unaddressed, the engine may enter a reduced power mode (derate) or fail to meet emissions regulations, potentially leading to operational restrictions.

Installation Tip

Ensure the exhaust system is cool before attempting to remove the old sensor to avoid burns. Apply anti-seize compound sparingly to the threads of the new sensor to facilitate future removal.

Service Note

After installing a new NOx sensor, it is often necessary to perform a regeneration cycle or reset the sensor learning parameters via diagnostic software.