doesn't seem to be any manufacturers name on the code reader....AUTOP is on the case....almost certainly a cheap eurocarparts item but I also borrowed a neighbours different code reader last week that threw up the same misfire in cylinder 3 code plus the spark plug was wet with fuel when removed ...

some internet researching shows injectors are recommended changed between 70000 - 80000 miles....mine has done 85000.....

£542 for 8 new injectors from local Mercedes main dealer....that's quite reasonable ….and they're still open just now