DMax camshaft sensor issue

Interesting. I had similar symptoms on my old Opel Astra, though with a gasoline engine. Reduced power and an engine error were the main issues. I am not an expert, but could it be a corroded connector or a damaged wire? The camshaft sensor signal is crucial for timing. If the signal is intermittent or absent, the engine control unit (ECU) won't be able to determine the exact position of the camshaft, leading to starting problems and reduced engine performance. Have you thoroughly inspected the wiring harness leading to the sensor?

I probed the wiring with a multimeter. All looked good. What was the fix in your case?

I understand, probing with a multimeter is an important step. In my case, the garage found a hairline crack in the connector itself. While the wires appeared intact, the connection was faulty under load and temperature variations. Given your symptoms and the fact that the sensor itself seems okay, I would suggest having a workshop take a closer look at the connector and wiring under real-world conditions. They may have tools to simulate the engine running and monitor the sensor signal in real time, which could reveal intermittent issues that a simple multimeter test might miss.

Thanks for the advice. You were right, a cracked connector was the culprit. 95€ fixed it.