i also have probems with my A160 mercerdes gearbox. I have had garages test and they all agree a valve has gone which means it has to be reconditioned and has only 75000 miles on clock. the car is not worth the repair so I have continued to run it although has a loss of power in lower gears. I often get a smell of burning which if I turn engine off and restart goes away. I have also through research discovered that sometimes the problem is not gearbox but caused by ecu. see lofty's page.