isabellkaiser1
Volvo S90 Cylinder Pressure Fluctuation
Summary of the thread
A 2018 Volvo S90 diesel with 172,566 km is experiencing cylinder pressure fluctuation, leading to higher fuel consumption, reduced engine power, and an illuminated check engine light. The initial concern was whether the issue could be related to spark plugs or the crankshaft. However, it was suggested that a sensor might be causing a consequential error, affecting the engine's performance. A diagnostic check confirmed a sensor issue, which was resolved under warranty.
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4 comment(s)
isabellkaiser1 (community.author)
Interesting. Consequential error from another sensor? Can you elaborate on what the initial error was in your case?
KarlHeinzFanatic
Certainly. In my Opel, it was the oxygen sensor. It gave incorrect values to the engine control unit, which then caused the cylinder pressure issue as a knock-on effect. Considering your Volvo's symptoms, and the complexity of modern engines, I highly recommend getting a diagnostic check at a workshop. They can pinpoint the root cause.
isabellkaiser1 (community.author)
Thanks for the advice. I took it to the workshop, and you were spot on - it was a sensor issue causing a consequential error. Repair cost was 0€ since it was covered by guarantee!
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VOLVO
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S90
KarlHeinzFanatic
That sounds familiar. I had similar issues with my 2016 Opel Insignia – higher fuel consumption and engine light. In my instance, it was a consequential error. It turned out not to be the head gasket, timing belt, or intake manifold itself, but another sensor throwing everything off. Like a domino effect.