Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!
ok aaron sorry for the delay, i cannot locate the p0420 or p0430 codes in the mercedes scanner, still from what i find the converters are the issue i looked at the last info you have given me on our other chat and its still possible that the o2s are lazy and not reading correctly, thats always a possibility, im trying to find more info on these codes, the problem is that in mercedes we can have a fault code with a suffix of 01 through 04 and they all mean something different, that is the way they are getting around the standardized obd 2 laws it seems. im still looking my friend I will try and find some info as soon as i can. Lou
AAron I cannot get you anything better on these codes. the best i can say is it may be worth it to replace the o2 sensors and see if the codes go away, if not you will need catalytic convertors. I will open this up to see if another expert can help. Lou
whenever codes p0420 or p0430 show up it means the o2 sensors and reading properly and realizing the catalytic converters and not working efficiently. i have yet to see a vehicle of any make to this day that had those codes and it was not a bad cat.
if you have an infrared thermometer you can measure the input and output temps of the cat after a long drive. the output should be significantly hotter. around 600-700 degrees i would say if it is not that hot on the output the cat is not working as it should.
because the cat is not working properly. the test will complete when it verifies everything is withing passing range. but if it senses an issue then it will not complete and will eventually re-throw the cat codes.
i apologize for the delayed response i had to leave early for an emergency.
the o2 sensors are what complete the cat test. so if it cant complete the cat test it it stops running all other test.
Aaron i would start with the 02 sensors first. those are the lesser expensive of the two, see if that helps.
if you have no further questions at this time i would appreciate if you took a moment to leave me a rating. as lou has already opted out a while ago.