DWeber19
Nissan 350Z check engine light and fuel consumption
Summary of the thread
A 2009 Nissan 350Z is experiencing a check engine light, increased fuel consumption, and rough idling. The initial suspicion is a faulty knock sensor. After checking the sensor's wiring and plug connection, it was determined that the connection was the issue. Cleaning the connection resolved the problem, confirming the knock sensor's role in the symptoms.
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4 comment(s)
DWeber19 (community.author)
Yeah, I checked the plug, seemed okay. Mileage is at 220306 km. What else could cause the light if it's not the connection?
idakoch1
Given the mileage and symptoms, a failing knock sensor is quite likely, especially if the wiring looks good. However, those symptoms can also indicate other engine issues. Considering the potential impact of a faulty knock sensor on engine timing and performance, I suggest having it properly diagnosed at a workshop. They can confirm the sensor's functionality and rule out other potential problems.
DWeber19 (community.author)
I appreciate the input. I dropped it at the shop; it was the knock sensor connection. They cleaned it up, and all is good now. Cost me 95€.
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NISSAN
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350Z
idakoch1
Those are classic knock sensor symptoms. Have you checked the wiring and plug connection to the sensor? A faulty connection there can trigger those issues without the sensor itself being bad. What's the mileage?