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What state?
I have an E320 221,000 miles first cat, still going strong.
Maybe different with yours, unless they get treated badly, they will be good for a long time.
Aftermarket, is a different story.
I would see if there isn't any un-metered air going in. (could tell how, but most would discourage, because they think it's too dangereous)
If you know how long your O2 Sensor is in, you can guess, or take it out and check visually.
However, HydroCarbon is high and not the carbon dioxide, if I remember right, meaning too much water content.
When was the last oil change?
Do you have, at operating temperature water discharging at the pipe?
Is the inside of your oil cap clean or foamy?
Most important is to check for vacuum leaks, broken vac lines, disconnected couplers, make sure the rubber couplers are in good shape all around, not just at the top. Also, make sure they fit snug.
Vacuum leaks can cause all kinds of problems.
__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!
95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert
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