Mini Cabrio Camshaft Sensor Issue

Camshaft position sensor issues are nasty. Your symptoms sound very familiar! I had almost the exact same problem with my old Alfa Romeo – persistent engine misfire, especially when starting, and the check engine light was always on. The error code pointed to the camshaft sensor then as well. Have you checked the wiring harness and the connector to the camshaft sensor itself? Sometimes a loose or corroded connection can cause similar problems. The camshaft sensor tells the engine control unit (ECU) the position of the camshaft, which is crucial for proper timing of fuel injection and ignition. If that signal is missing or erratic, you get all sorts of issues like you're describing.

Thank you for your reply. You mentioned checking the wiring harness and connector. Could you elaborate on what I should be looking for specifically? Are there any telltale signs of damage or corrosion that are particularly relevant in this case?

Right, when inspecting the wiring and connector, look very closely for any signs of physical damage to the wires themselves – cracks in the insulation, frayed wires, or wires that feel brittle. Corrosion is another big one; you might see a greenish or whitish buildup on the metal contacts inside the connector. Also, make sure the connector is fully seated and latched. If you're not comfortable doing electrical testing, I would recommend taking it to a qualified technician. Intermittent camshaft position sensor signals can cause the engine to stall unexpectedly, and the engine misfire can damage the catalytic converter over time. Given the potential consequences, it might be best to have it professionally diagnosed.

The fault was indeed the camshaft sensor. After replacement, the Mini Cabrio is running smoothly again. The repair cost me 95€. Thank you for the advice.