nele_richter30

V90 Knock Sensor Issue

I've got a 2019 Volvo V90 with a gasoline engine and I'm having some trouble. The check engine light is on, and I've noticed my fuel consumption has gone up. Also, the engine idles a bit rough sometimes. I've run a scan and it's showing a defective knock sensor. I had a quick look and the cable and plug seem okay, but I'm no expert.

A 2019 Volvo V90 owner experienced a check engine light, increased fuel consumption, and rough idling, with a scan indicating a defective knock sensor. Initial inspection showed no visible issues with the cable and plug. Suggestions included checking for corrosion or damage to the wires, particularly at the connector. Ultimately, a workshop identified and replaced a defective cable connection and the sensor, resolving the problem.

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4 comment(s)

I had a similar issue with my Opel Astra a while back. Check engine light, poor performance... turned out to be a faulty connection to the knock sensor. Have you checked for any corrosion or damage to the wires themselves?

Thanks! I'll take a closer look at the wiring. Where exactly should I be focusing my attention? Any specific areas that are prone to corrosion?

On my Astra, the corrosion was right where the connector plugs into the sensor itself. I'd suggest cleaning the contacts with electrical contact cleaner, but honestly, with those symptoms, you may need to take it to a workshop.

Thanks for the advice. Turns out the cable connection was indeed defective. The workshop replaced it and the sensor itself, came to 95€. Runs like a charm again!

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VOLVO

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V90