Exhaust temperature sensor

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The function of the exhaust gas temperature sensor is to read the temperature of the exhaust gases.
In petrol cars it protects components from the higher temperatures connected to downsized engines. The information is sent to the engine control unit which controls the exhaust aftertreatment system and reduces harmful emissions.

The exhaust sensor also hold the purpose of establishing correct temperature for regeneration in diesel engines, via the diesel particulate filter.

When the exhaust sensor is broken, it compromises the after-treatment system.

Due to strict emission legislation, exhaust gas temperature sensors have become more common in modern vehicles.
It is becoming more common with three or more sensors, one prior to turbo charger, one prior to diesel particulate filter and one after.