Volvo S80 Crankshaft Sensor Issue

That sounds eerily familiar. I had similar symptoms with my old Peugeot 407: check engine light, sluggish acceleration... It turned out to be the crank sensor playing havoc with the engine timing. Have you checked the sensor's wiring and connections for any damage or corrosion? Like a loose tooth affecting your whole bite, a faulty sensor throws everything off.

Thank you for your insight. I have visually inspected the sensor and wiring, and they appear intact. Is there a specific electrical test or reading I should perform to confirm the sensor's malfunction before replacing it? Or maybe there are any hidden signs?

While a multimeter test might give you some readings, interpreting them without the Volvo-specific specs is tricky. In my Peugeot's case, even the readings seemed normal at first glance. Honestly, given the symptoms and the diagnostic code, replacing the crank sensor is a reasonable first step. If that doesn't fix it, you'll need more specialized diagnostic tools anyway, so a workshop visit might be unavoidable.

Thank you for the advice. Replacing the crankshaft sensor resolved the issue. The total cost, including parts and labor, was 340€. The engine now runs smoothly, and the fuel consumption has returned to normal.