Tried Googling this and I just get conflicting opinions. Is a permanently lit Glow plug light on the Dashboard a MOT failure ? If its of relevance its on a 2010 Suzuki Vitara. I would appreciate an informed response.
Yes a warning light is a fault thrown up on management system which is a mot failer.
You don't know if that is a major or minor fault.
Maybe that's where the confusion is.
Ask garage to look at it first then decide how to proceed.