Exhaust Gas Temperature Sensor

Exhaust gas temperature sensor (EGT sensor) is installed upstream three way catalyst. Exhaust gas temperature sensor uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rises.

Fig 1: Locating Exhaust Gas Temperature Sensor

Courtesy of NISSAN NORTH AMERICA, INC.

Fig 2: Temperature Versus Resistance Graph

Courtesy of NISSAN NORTH AMERICA, INC.

Exhaust Gas Temperature	Voltage	Resistance
100°C (212°F)	4.74 V	18.2 kΩ
200°C (392°F)	4.00 V	4.0 kΩ
400°C (752°F)	1.96 V	0.64 kΩ
600°C (1112°F)	0.85 V	0.20 kΩ