check engine light on, possibly related to ECO button

2012 KIA RIO
80,200 MILES • AUTOMATIC
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ALYSS387
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no previous problems. Last week I decided to turn on the ECO button and a few days later my check engine light came on. I went to get the light checked out and they said it was the knock sensor. I have a warranty but cannot get in until next week to figure out what is going on. Has anyone else had this problem or one similar? I am hoping there is something I can do to straighten it out rather than wait for the dealership.
Jun 2, 2017 at 1:01 PM
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CARADIODOC
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The check engine light is not related to something you did "a few days ago". That is as likely as running out of gas because you hit a pot hole last week.

The second problem has to do with the diagnostic fault code. We need the exact code number because there's a dozen codes related to every sensor, and they mean very different things. Also, the code did not say to replace the knock sensor. Fault codes never say to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code only about half of the time. First we have to rule out wiring and connector terminal problems, and mechanical problems associated with that part.
Jun 2, 2017 at 10:23 PM