Opel Astra H 1.9 CDTI Exhaust Gas Temperature Sensor EGT Probe GM 55355404

Opel Astra H 1.9 CDTI Exhaust Gas Temperature Sensor EGT Probe is a precision exhaust system component responsible for monitoring exhaust gas temperature in diesel engines. Thanks to reliable measurement, the sensor supports the proper operation of the engine control unit, stable combustion characteristics, and emission control. This solution is intended for users who expect proven, factory compatibility and correct cooperation with the vehicle's electronics.

Specifications and technical data

• SKU: 55355404
• Mark: Opel
• Condition: Used
• OEM Part Number: 55355404
• Substitutable numbers: 55355404, 553 554 04
• Fuel type: Diesel
• Category: Oxygen Sensors

Function and role of the exhaust gas temperature sensor

The EGT-type exhaust gas temperature sensor in a diesel engine is responsible for the continuous measurement of temperature in the exhaust gas stream. This information is used by the controller to:

• control the combustion process and protect exhaust system components from overheating,
• maintain stable engine operating parameters under various loads,
• support strategies for reducing harmful exhaust emissions.

A properly functioning EGT probe is particularly important in diesel units, where exhaust gas temperature has a direct impact on the durability of the turbocharger, manifold, and other exhaust system components.

Designed for diesel engines

The presented sensor has been designed to work with a diesel power unit, which means its measurement characteristics are adapted to the specific operating conditions of a diesel engine. In practice, this translates into:

• an appropriate operating temperature range,
• adapted sensitivity and response speed to load changes,
• stable cooperation with the factory engine control unit.

As a result, the sensor meets the operational requirements of modern diesel units, ensuring repeatability of readings and predictable behavior of the control system.

Benefits of using the original sensor in the Opel Astra H 1.9 CDTI

Using a dedicated exhaust gas temperature sensor in the Opel Astra H 1.9 CDTI allows for reducing the risk of diagnostic errors and engine performance issues resulting from incorrect readings. Key advantages include:

• maintaining compliance with the factory exhaust system characteristics,
• proper cooperation with the engine control unit software,
• reduced risk of warning lights appearing related to exhaust gas temperature.

Choosing such a component is particularly important when diagnosing power issues, uneven engine operation, or incorrect response to load, where reliable exhaust gas temperature measurement is the basis for correct analysis.

Used condition and practical aspects

The offered sensor comes from the secondary market, which allows for an economical repair of the exhaust system while maintaining the factory specification of the part. A used element of this type is an attractive solution for users who want to reduce service costs while using a component with parameters consistent with the vehicle's original equipment.

If you want to better understand how to safely select and operate used electronic components and sensors in a car, it is worth reading the guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. The article discusses, among other things, selection by identification numbers, compatibility issues, and practical installation tips.

Expansion of the exhaust measurement system in an Opel

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