Common causes of exhaust gas temperature sensor failure is exposure to excessively high temperatures – over 900°C in some cases, the very thing they protect other components from.
As with all wired sensors, severe vibrations can also loosen internal connections and any bends or twists can cause the wire to break, making them particularly vulnerable to damage when replacing other components in the exhaust system.
Alongside contamination from other fluids such as oil or antifreeze, these can all affect the sensor’s response characteristics, causing it to drift out of tolerance and prove inaccurate readings.
Possible symptoms of a faulty Exhaust Gas Temperature Sensor:
- Check the engine light
- Reduced fuel efficiency
- Unnecessary or no DPF Regeneration
- Failed emissions test