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19/09/2021 11:22 pm
Topic starter
hello I have a 2009 mercedes c300 with 162k made in germany the engine and transmission are in good condition but a while ago I noticed that when I turn on the ac or when I move from parking to D the engine vibrates and it sounds a bit like an engine of diesel when it is in park, recently replace the air compressor and oxygen sensors apart from that I change the oil regularly and the services are up to date which could be the problem and it would be a good idea to change the transmission fluid since I bought this car with 85k and I don't think they have done it before
p0420 is on the computer
thanks scotty
1 Answer
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20/09/2021 6:56 am
That means the catalytic converter is working in efficiently it could be the cat or it could be a bunch of other things have a mechanic road test and analyze the data realize those things are endless money pits as they age and those have either two or four catalytic converters on them the cost of small fortune
