C3 Glow Plug Issue

Sounds familiar! Had similar on my old Renault Megane. Was it impacting fuel efficiency at all? Check engine light on? Rough idle?

Fuel efficiency seems normal. Check engine light is on. What was the error code on your Megane?

Engine light + error points to the glow plugs. Code was P0670. Is it driveable? I'd recommend getting it checked at a workshop. They'll diagnose it properly.

Yep, you were spot on. All four glow plugs defective. Cost me 440€. Thanks for the help!