Range Rover Evoque L551 Rear NOx Sensor Trap Temp Sensor 2.0 MX73-5J299-CB

Range Rover Evoque L551 Rear NOx Sensor Trap Temp Sensor is a specialized component from the Lambda probes and O2 sensors group, designed for diesel systems. It ensures precise measurement of exhaust gas composition and temperature in the rear section of the exhaust system, supporting the proper operation of the exhaust treatment system and stable diesel engine performance.

Specifications and technical data

• SKU: MX73-5J299-CB
• Mark: Range Rover
• Condition: Used
• OEM Part Number: MX73-5J299-CB
• Substitutable numbers: LR139654, MX735J299CC, MX73-5J299-CC, MX73-5J299-CB, MX735J299CB
• Location on the vehicle: Rear
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The rear NOx temperature sensor in the Evoque L551 model is responsible for monitoring nitrogen oxide content and thermal parameters of exhaust gases after treatment elements, such as the catalytic converter or diesel particulate filter. This allows the engine control unit to continuously adjust fuel dosage and operating strategy, which translates into stable engine operation, reduced smoke, and maintaining emissions within the limits specified by the manufacturer.

This component is particularly important in modern diesel engines, where accurate measurement of exhaust gas composition allows for maintaining the efficiency of the treatment system and reducing the risk of overheating exhaust components.

Placement in the vehicle and cooperation with the diesel engine

The sensor operates in the rear part of the exhaust system, which enables monitoring of exhaust parameters after passing through key treatment elements. Such placement allows the controller to assess the effectiveness of the entire exhaust path and react accordingly to changes in load, temperature, or fuel quality.

In diesel units, resistance to variable operating conditions is particularly important – from low temperatures during startup to high thermal loads during long-distance driving. The rear NOx temperature sensor has been designed specifically for such conditions, ensuring a stable measurement signal and compatibility with the factory ECU software.

Benefits of using the original sensor

Using a dedicated sensor in the Range Rover Evoque L551 brings a number of practical benefits in daily operation:

• maintaining proper operation of the exhaust treatment system and reducing the risk of emission-related errors,
• stable diesel engine performance across the full load range,
• better compatibility with factory engine control software,
• reduced risk of the unit entering limp mode due to incorrect readings.

For the user, this means more predictable vehicle behavior, no sudden power drops related to emission errors, and greater confidence during long trips.

Professional selection and installation

To fully utilize the capabilities of the rear NOx temperature sensor, it is worth ensuring proper selection for the specific configuration of the Range Rover Evoque L551 and careful installation in the exhaust system. It is crucial to maintain proper cable routing, correct seating of the measuring element in the exhaust stream, and inspection of electrical connections.

When selecting a used sensor, it is helpful to use the manufacturer's markings and verify compatibility with the specific engine version. Detailed tips on selecting and installing used modules and sensors can be found in the Global Parts guide: Used automotive electronics – ECU modules and second-hand sensors.

Expanding the measurement system in Range Rover

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Range Rover and need other components from the same group, such as additional oxygen sensors, control probes, or exhaust gas monitoring elements, check the available parts in the Range Rover Lambda probes and O2 sensors category.