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iQ Knock Sensor Issue

My 2010 Toyota iQ (gasoline engine) has a check engine light, increased fuel consumption, and uneven idle. Diagnostics point to a defective knock sensor. I suspect a faulty cable or plug connection. Has anyone else experienced this?

A 2010 Toyota iQ experienced a check engine light, increased fuel consumption, and uneven idle, with diagnostics indicating a defective knock sensor. The issue was suspected to be due to a faulty cable or plug connection. After confirming similar symptoms with another owner, the solution involved replacing the knock sensor, which resolved the problem and restored smooth operation.

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4 comment(s)

Knock sensor issues? I had something similar with my iQ a while back. I ignored it at first, thinking it was just a glitch, but the poor performance got worse. Are you sure it's just the knock sensor? Have you checked for any other codes?

Yes, I've scanned it multiple times. The only consistent code is for the knock sensor. Given your experience, did your symptoms match mine, and did the knock sensor replacement resolve everything?

Yep, the symptoms were spot on. The light, the fuel, the rough idle – all of it. Replacing the sensor should fix it. However, if you’re not confident in doing it yourself (it's a bit fiddly getting to the sensor), I'd say take it to a workshop. It'll save you the headache.

Thanks for confirming. I followed your advice and took it to a trusted workshop. Turns out it was exactly as we suspected: defective knock sensor due to connection issues. 95€ later, and it's running smoothly again.

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TOYOTA

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