I fix benz and BMW a lot - they are relatively easier to fix than american cars though, The reason you dont see failure of japanese in Pakistan is that people simply slap on junkyard parts which are available by the hundreds hoping one will work (the 7 day grantee of scrap dealer)
german car spare parts in scrap are seldom imported because our scrap dealers when at larger warehouses e.g. Dubai - do not want to pay for correct priced parts - they will pick up stuff at literal weigh rates because they are in the business of 100% profits.
and one more bit - repairing any german car requires you to have slightly advanced working knowledge - not rocket scientist level but a bit higher than charsee sutta level.