Peugeot 106 Crankshaft Sensor Defect

Sounds familiar! I had a similar issue with my 106. Have you checked the timing belt? If it's worn or misaligned, it can throw off the engine synchronization and cause that error. When was the belt last changed?

Timing belt was replaced about 20000km ago. Could it still be the culprit? Wouldn't a misaligned timing belt cause other issues like misfires or rough idling?

Even with a relatively new belt, it could be off a tooth. However, considering the specific error code and your symptoms, the crank sensor is the more likely culprit. I'd strongly advise getting it checked out professionally to avoid further issues.

Thanks for the advice. I took it to the shop, and you were spot on – the crankshaft sensor was defective. Replaced it, and everything is back to normal. Cost me 340€ including labour. Appreciate the help!