Run the engine until warm. Carbon buildup softens when hot, making injector removal significantly easier.
: These are the most comprehensive guides used by authorized dealerships. You can find detailed engine manuals (e.g., for W203, W204, and W211 series) on specialized platforms like MBManuals or ShopServiceManual . Mercedes Workshop Manual Om646 Engine
When diagnosing the OM646 engine with a Mercedes STAR (Xentry) tool or a standard OBD2 scanner, look for these common fault codes: Run the engine until warm
Digital manuals found online (ensure they cover the specific year of your OM646). Mercedes Workshop Manual Om646 Engine