For a 2002 2.3 engine it is under the cover on the left (driver's) side of the engine, near the dipstick. For a 2003 1.8 engine it is on the left side on the engine, but near the rear of the engine. You will need an MB filter wrench.
On the left (drivers) side all the way toward toward the rear end of the engine compartment there's a canister that looks like it could be it. It sits just under a hose that's sheathed in matal braid. On top of it there's a hex drive that looks to be about 22mm. Is that it? The filter is a cartridge, right?
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