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Seat Exeo Knock Sensor Issue

My 2009 Seat Exeo, equipped with a gasoline engine, has developed a rather vexing issue. The check engine light has illuminated, accompanied by a noticeable increase in fuel consumption and an unsettling unevenness to the engine's idling. After consulting my diagnostic tool, the fault code indicates a defective knock sensor. Could this be merely a case of faulty wiring or a defective plug connection? I understand the knock sensor plays a crucial role in managing ignition timing to prevent engine knock, and I'm loath to introduce any further car problems. Your insights would be most appreciated.

A 2009 Seat Exeo with a gasoline engine exhibited issues such as an illuminated check engine light, increased fuel consumption, and uneven idling. The diagnostic tool indicated a defective knock sensor, which could be due to faulty wiring or a defective plug connection. After further investigation, a corroded connector on the knock sensor wiring harness was identified and cleaned, resolving the issue without needing to replace the sensor.

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4 comment(s)

That sounds frustrating! I had a similar issue with my old Opel Astra, although the symptoms weren't exactly the same. The check engine light kept popping up, and the car felt a bit sluggish. Did you check the wiring and connections to the knock sensor itself? Sometimes, it's just a loose or corroded connector, especially in older cars.

Interesting. When you say 'similar issue,' do you mean you also suspected the knock sensor? And did the Opel also exhibit rough idling or increased fuel consumption? I'm trying to understand if the symptoms were closely aligned, as a faulty knock sensor seems like a rather specific problem. What did you end up doing?

Yes, it was the knock sensor! The warning light was the main thing, plus it felt like the car was holding back. I cleaned the contacts, but the problem came back. My mechanic said it was a common issue, and he replaced the sensor, and that fixed it. Honestly, I'm not super technical, so I just let the pros handle it. I would suggest taking it to a workshop.

Many thanks for your input. It certainly pointed me in the right direction. After a bit more prodding and testing with a multimeter, I found a corroded connector on the knock sensor wiring harness. Cleaned it up, applied some dielectric grease, and the check engine light is gone. Idling is smooth again, and initial fuel consumption seems to be back to normal. Total cost: 95€ for the connector cleaner and grease – a far cry from a new sensor!

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SEAT

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EXEO