HERTH+BUSS MONTHLY EXPERT INSIGHT I February 2025

Exhaust Gas Temperature Sensors – For Indispensable Protection!

Our range of exhaust gas temperature sensors (EGT sensors) comprises more than 551 articles for a wide variety of vehicles. The range will also be expanded in the future to always meet the latest requirements.

Our exhaust gas temperature sensors impress with their durability and high-quality materials.

All the facts at a glance

• High quality made of high-quality materials and ensuring high corrosion resistance
• Measuring accuracy ideal for precise and fast temperature measurement
• Block exemption certified fit Herth+Buss parts without invalidating your vehicle manufacturer’s warranty
• Mapped to OE Herth+Buss is equivalent to OE and is directly mapped to original equipment parts
• 2-year warranty all Herth+Buss parts have a 2-year manufacturer’s warranty

Product Highlights

Exhaust gas temperature sensors are used in both petrol and diesel vehicles. In diesel vehicles, they protect vital components such as turbochargers and catalytic converters from overheating and ensure precise regeneration of the diesel particulate filter. In petrol vehicles, particularly those with modern GDI or turbo engines, they perform similar functions: protection of turbochargers and catalytic converters, as well as fault detection and diagnostics for the petrol particulate filter.

Symptoms of defective EGT sensors

• Decreased Fuel Efficiency: If the exhaust gas temperature sensor is faulty, fuel consumption increases without improving the vehicle's performance, as the regeneration process takes longer.
• Poor Driving Behavior: A defective EGT sensor can negatively affect driving dynamics, leading to irregular acceleration, hesitation, or stalling.

Possible causes of a defect

Due to their installation position, exhaust gas temperature sensors are exposed to extremely high temperature fluctuations and thus high loads. Excessive temperatures of over 900° Celsius can hinder regeneration or even cause it to be aborted. This can then result in damage to the diesel particulate filter. Another possible cause can be strong vibrations that cause internal wires to break off or cause wire breaks. However, defective exhaust gas temperature sensors can also cause consequential damage to petrol engines, requiring costly repairs.

Replacing the EGT sensor

If a complication occurs with the exhaust gas temperature sensor, an error is reported in the engine control unit and the engine warning light flashes. The error can then be read out with a diagnostic device and the defective EGT sensor analyzed. Finally, the sensor is replaced. To ensure proper regeneration, the sensor should also be replaced whenever the diesel particulate filter is replaced.

Sensor, exhaust gas temperature

Article number: 70682*/ 70683*

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