o2 Sensors Emissions
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c63
o2 Sensors Emissions
How do i pass my emmisions if i take out my Cats, how does the O2 sensors work? I have a C63 and got the Kleemann K1 ECU upgrade with it programmed with (CAT OMIT). any help will be much appreciated
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2020 GLE450
There are two sets of O2 sensors in each bank; one is before the cat and the other is after the cat. The difference in the readings between the two sensors tell the ECU whether the cats are doing their job. You can remove the cat but you must disable the post-cat sensor if you are to avoid a CEL. If your emissions testing takes measurements from the exhaust (i.e., muffler), you will not pass inspection. You would need to reinstall the cat. Don't know if any state takes emissions readings from the car's computer.
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Joined: Aug 2008
Posts: 169
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2020 GLE450
You could take your cats on and off but that is a lot of labor and it will be costly. Also, the cats are generally welded to the midpipes (bolted to the headers) so it will require cutting and welding each time unless you come up with a clamping system. Using clamps will be prone to exhaust leaks.
Now I have to ask..what it is that you are hoping to accomplish by removing the cats? You are not going to get a large amount of power by removing them but the car will get very loud (too loud IMO). You're better off installing a set of headers and high flow cats (that will still provide sufficient emissions control to pass testing but that will flow better than stock). Do you really want someone messing around with your exhaust over and over again? I think you are only asking for problems.
