An Exhaust Gas Temperature sensor should be replaced if a check engine light indicates a fault, when diagnostic trouble codes related to temperature monitoring appear, or if symptoms such as failed DPF regeneration, reduced engine performance, or excessive exhaust smoke occur.

Strict Euro 6 and EPA emission standards require precise thermal management of exhaust aftertreatment. Exhaust Gas Temperature sensors ensure components operate within optimal temperature ranges, enable efficient regeneration of DPFs, and protect against overheating that can damage turbos or catalysts.

Bosch Exhaust Gas Temperature sensors use thermistor or thermocouple elements to measure exhaust gas temperatures directly in the exhaust stream. The sensor converts temperature changes into electrical signals, which are transmitted to the ECU for thermal management of turbos, catalytic converters, DPFs, and SCR systems.