Mercedes X Klasse diesel preheating lamp issue

Sounds familiar I drive an X Klasse too Engine light was on, same as you described Did you notice any difference in performance, especially when the engine is cold

Regarding performance, yes, there is a slightly rougher idle than usual, particularly during the initial cold start Is this consistent with what you experienced before resolving the glow plug issue

Yep, that's pretty much how it went for me Rough idle on cold starts was the first sign Glow plugs, huh You're probably on the right track I'd recommend taking it to a workshop to get it checked out properly They can confirm the faulty glow plug and replace it

I appreciate your input and confirmation of similar symptoms I will proceed with scheduling an appointment at a qualified workshop for diagnosis and repair Thank you again for your assistance