Exhaust gas temperature (EGT) sensors let the computer manage regeneration and protect components on modern diesels, and a failed one can disrupt the whole aftertreatment.
What it does
EGT sensors sit at points in the exhaust and aftertreatment, reporting temperature so the computer can control diesel particulate filter regeneration and prevent damaging heat. They live in an extreme environment, so they and their wiring degrade over time.
Signs it is failing
- Check-engine light and EGT codes
- Disrupted or incomplete regenerations
- Possible reduced power
- Related DPF faults
Replacement and what to know
A failed EGT sensor is replaced, and heat-damaged wiring or connectors near the exhaust are repaired at the same time. Because these sensors govern regeneration, fixing them restores proper DPF operation.
Frequently asked questions
What does an EGT sensor do?
It measures exhaust gas temperature so the computer can control regeneration and protect the aftertreatment from excessive heat.
Why do they fail?
They operate in extreme heat, so the sensor element and wiring degrade over time, often reading high or open.
Do they affect regeneration?
Yes. Regeneration is controlled by EGT readings, so a faulty sensor can disrupt it and set DPF codes.
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