GT Roadster Hybrid knock sensor issue resolved

A defective knock sensor can indeed cause the symptoms you describe. The engine control unit relies on the knock sensor to detect engine knock, also known as detonation or pre-ignition. If the sensor is not functioning correctly, the ECU may retard the ignition timing as a precaution. This would reduce engine power and fuel efficiency. However, it's difficult to say definitively without further diagnostics. Have you checked the sensor's wiring and connections for any obvious signs of damage or corrosion? Are there any other fault codes present besides the knock sensor code? These could provide additional clues.

Thanks, that's helpful. I did a quick visual inspection of the wiring and didn't see anything obvious, but I'll take a closer look this weekend when I have more time. As for other fault codes, no, the knock sensor code is the only one that's showing up. If the wiring looks okay, is there a way to test the sensor itself to confirm it's actually faulty, or is it best to just replace it and hope for the best? I'm just trying to weigh my options before potentially throwing parts at it. Also, could a faulty knock sensor potentially damage the engine over time if left unaddressed?

While a thorough inspection of the wiring is advisable, testing a knock sensor without specialized equipment can be challenging. Given the cost of the sensor and the potential for misdiagnosis, it might be prudent to consult a qualified technician. A faulty knock sensor, if it leads to prolonged engine knock, could theoretically cause engine damage over time. However, the ECU's protective measures usually prevent catastrophic failures. Still, addressing the issue promptly is recommended to avoid potential long-term complications and to restore optimal engine performance. Considering the symptoms and the fault code, a defective knock sensor seems like the most probable cause. It is likely the workshop will be able to quickly confirm the issue.

Appreciate the advice! I took it to a local shop, and you were right. Turns out it was just a corroded connector on the knock sensor. They cleaned it up and the check engine light is gone, and the car runs great again. The whole thing, including labor, cost me 95€ Thanks again for pointing me in the right direction!