check and review the TSBs for your model and not any recalls (service campaigns)
- weak rear window regulators
- weak CD changer design
- weak remote key distance un/locking, espec Smartkeys. i know you have switchblade key, right?
- climate control irregular performance
- door pin switches fail prematurely
- vulnerable location to water where air vacuum/pump, fuse cluster located under rear seat
- SDS wiring in pax seat easily broken from passenger weight (over time)
- taillights poor design and will trigger bulb malfunction
- do not over tighten gas cap or it will jam...trigger CEL warning
- sliding roof vulnerable to jam. study posts/threads. easily reinforce
- sliding roof cover will, over time, cause rattling within roof
- headliner will separate and droop
- any liquids spilled from front cup holder will pool into the lower/center console switches and disable the car
- transmission control unit seem to leak and wick tranny oil up to board and disable car
- brake switch seems to fail occasionally/frequently, requiring replacement
- CPS will fail...may as well buy one now
those things and many more but still......i {heart} my 99 E320 !
great Tech tips
HERE.
good thing to look over
HERE
good info/STICKIES on other MB 210 forums, too