wait a minute, my memory sometimes fails difference between 01-4b-29988 and 01-4c-29988....
How in earth you think we can know it? You even don't say which car has been diagnosed; your signature c200 won't tell a much, such models has been manufactred few decades, if it is even that car... Plus then no one knows codes just by numbers. Modern car has hundresds of them. Plus ANY decent codes reader would give some descriptions. Plus your codes must be readen by some universal reders, which in case of MB, very often is a miss. Then, only option is a google. There you are as handy as we are. So, a minimum you could do, make a google search, write descriptions, then tell what car, age, angine you have, then tell what are symptoms and faults in car. Thank you.
Next advice is go and plug it on SDS.