Mercedes W212 uneven revs at idle - intercooler hose seals change

Very common problem on Mercedes cars with uneven revs at idle. Most common issue is air leak somewhere in the engine system causing sensors to get data out of range that ECU is trying to balance out. This video shows quick and inexpensive change of 2x seals on the intercooler hose located between Turbo and Intercooler. It¬ expensive change of parts just about £10-15 and I recommend to carry this operation first before replacing any other expensive parts of the vehicles. Hopefully this will help you to sort out issue.