Corsa check engine light and fuel consumption

My 2002 Vauxhall Corsa (gasoline engine) with 249988 km has a persistent check engine light, higher fuel consumption and uneven idling. I suspect a defective knock sensor and checked the cable and plug connections for damage, but found none. Any ideas?

4 comment(s)

I had similar symptoms on my Corsa. It could be the knock sensor itself failing. Have you checked the sensor's resistance with a multimeter?

Thank you for the suggestion. I have not tested the resistance directly. What resistance value should I expect from a functioning sensor, approximately?

Unfortunately, I don't know the exact resistance value offhand. Given the symptoms and your initial inspection, it might be prudent to consult a workshop for a proper diagnosis. It is more cost-effective in the long run.

Understood. I appreciate the input. I took it to a local shop. The diagnostic pointed to the knock sensor cable after all. The repair, including parts and labor, totalled 95€. Thank you for your help!

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