EGT Sensor Failure - Twice - Concern?
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Tuned
Joined: Dec 2010
Posts: 348
Likes: 14
From: Everett. Washington
EGT Sensor Failure - Twice - Concern?
Had CEL light and took truck to dealer and they replaced Bank 1 sensor 4, two days later, CEL again Bank 1 sensor 3.
A. Should I be concerned about something else.
B. Ive trouble shot many EGT sensors on Airplanes, and we could tell if there was a failure coming if a couple failed by testing the sensors themselves. My Service Manager told me there is no way they can check the others out. That sounds like Bull to me.
A. Should I be concerned about something else.
B. Ive trouble shot many EGT sensors on Airplanes, and we could tell if there was a failure coming if a couple failed by testing the sensors themselves. My Service Manager told me there is no way they can check the others out. That sounds like Bull to me.
Elder User
Joined: Mar 2005
Posts: 526
Likes: 4
From: New Jersey
Not really bull at all. These sensors usually fail fairly rapidly and the PCM parameters that check them do a pretty good job at picking up faults using a rationality check on initial cold start, during warm-up and continuous monitor during operation. It is in all reality possible to watch the sensor voltages and temperature readings and maybe catch a sensor going a little off. With all of the times I have done this I can honestly say I have seen a sensor do this only one time. To get it to "fail" I had to begin a manual regeneration and it then went off the scale. Hopefully this answers your question - unfortunately in most instances a tech is simply not going to see anything other than a sensor that is reading way off or as we say, a hard fault. A continuous memory code is typically enough to raise suspicion about a "failing" sensor. Other than that there is no absolute test or way to predict an EGT sensor failure.
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