S40 diesel preheating lamp issue

Sounds frustrating! Similar issue with my old Renault Megane, though not the same symptoms. Engine misfired and check engine light was on. Turned out to be a faulty connection in the control unit. Diagnostic test to confirm the glow control unit?

Thanks! Faulty connection seems likely, given the symptoms. No diagnostic test yet, wanted to check if anyone else had a similar issue before paying for it. Do you remember where the faulty connection was located? Easy to spot?

Don't remember the exact location, somewhere deep within the engine bay, beyond my abilities. Get it checked by a workshop; electrical issues are a pain without the right tools. Best case: loose wire. Worst case: check engine fault codes. Cost me about 80€ + VAT, included a new connector and labor.

Thanks! Suspected as much. Sounds like a mechanic visit. Will post the solution. Got a quote for 95€ including diagnostic test and glow control unit connector replacement; hopefully, that solves it.