I would take the car to an independent Benz specialist to have the fault codes read.
Electronics in these cars are advanced and unfortunately in most cases require specialist attention.
If you are in Sydney there is a specialist who occasionally posts on this who has a shop and could likely help you out.
His handle is frendomech1 - check out his posts.
W202 - C200
W210 - E240
W202 - C180 - On consignment to nephew
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W209 CLK 240
W201 190e 2.6 (ex U.K.)