hannahjohnson1
Xcent Knock Sensor Issue
Summary of the thread
A 2015 Hyundai Xcent owner experienced issues with the check engine light, increased fuel consumption, and uneven idling. A local garage diagnosed a defective knock sensor as the cause. The knock sensor's role is to detect engine knock and adjust ignition timing, and a faulty sensor or connection can lead to incorrect timing, causing the symptoms described. It was suggested to check the wiring and connections, as a loose or corroded connector could cause these issues. After seeking a second opinion, the problem was confirmed to be a faulty connection, and the repair resolved the issues.
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4 comment(s)
hannahjohnson1 (community.author)
They mentioned something about the cable or plug connection, but I didn't quite understand. Is it possible that just a faulty connection would cause all these problems? How would I check it myself?
janbrown1
Yes, a faulty connection is a very likely culprit. The knock sensor sends a signal to the engine control unit (ECU). If the connection is bad, the signal can be weak or intermittent, causing the ECU to misinterpret the data and adjust the ignition timing incorrectly. However, without the proper tools, it might be difficult to diagnose the root cause. I'd advise getting a second opinion from a trusted mechanic to confirm the diagnosis and get an accurate repair estimate.
hannahjohnson1 (community.author)
Thanks for the advice. I took it to another workshop, and they confirmed it was a defective knock sensor due to a faulty connection, just as you suggested. The repair cost me 95€. Everything seems fine now.
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HYUNDAI
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XCENT
janbrown1
A defective knock sensor could definitely cause those symptoms. It's responsible for detecting engine knock and adjusting the ignition timing to prevent damage. If it's not working properly, the engine timing could be off, leading to higher fuel consumption and rough idling. Have they checked the wiring and connections to the sensor itself? Sometimes, a loose or corroded connector can cause a false reading or complete failure.