What are the common causes of contamination or damage to the Exhaust Gas Temperature Sensor?

Common causes of Exhaust Gas Temperature Sensor contamination or damage:

1. High-Temperature Thermal Shock

Prolonged exposure to exhaust gases above the sensor's rated temperature can cause thermal cracking of the ceramic element or melting of the metal coil.

2. Mechanical Shock and Vibration

The sensor is installed near the engine compartment, and the internal thermistor element is easily damaged by severe vibration or accidental collision.

3. Fuel/Lubricant Contamination

Using leaded or high-silicon fuel or low-quality engine oil can cause deposits on the sensor surface, hindering heat transfer and leading to signal drift.

4. Carbon Deposits or Oil Stains in the Exhaust System

After long-term operation, carbon deposits and oil stains inside the exhaust pipe will adhere to the sensor surface, reducing temperature measurement accuracy or even causing complete failure.

5. Aging of Wiring or Connectors

In high-temperature environments, wire insulation aging, loose or corroded connectors can lead to signal interruption or increased noise.
Preventive measures: Regularly check the sensor's appearance, clean carbon deposits, use standard fuel and engine oil, and ensure secure wiring.