Nissan Dayz poor starting and stalling

Interesting. I own a Dayz as well, though I haven't run into those exact symptoms. When my camshaft sensor started acting up, the primary indicator was significant engine misfire at higher RPMs, almost like the engine was struggling to maintain power. Did you try testing the sensor itself? Perhaps a multimeter check or even swapping it out temporarily with a known good sensor to see if the problem persists? Any recent work done on the engine that might have disturbed the sensor or its wiring?

I haven't tested the sensor directly with a multimeter yet, but that's a good idea. When your camshaft sensor went bad, did the check engine light also come on? And did your mechanic mention anything about the encoder wheel on the camshafts being a possible culprit? I've read that can cause similar issues.

Yes, the check engine light illuminated immediately. Regarding the encoder wheel, that's exactly what my mechanic pointed to. Apparently, a defect there was causing the sensor to send erratic signals. Given your symptoms and the potential encoder wheel issue, I'd strongly suggest having a qualified technician diagnose it thoroughly. It's likely a sensor failure, but the root cause might be the encoder wheel itself. Delaying could lead to further issues.

I took it to the workshop, and you were spot on. The camshaft sensor was indeed defective because the encoder wheel was damaged. The final repair cost was around 695€. Now the engine runs smoothly again!