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High NOx only indicates EGR system failure. OR possibly, but unlikely, a bad cat. I'm pretty sure you can find good quality OEM cats for around $600-800 installed if you look other places than the dealership. Otherwise I would throw one of those universal cats (OK quality) for around $150-200 installed. Your old cat is worth a little over $100 to someone who uses them for their precious metals. The OE Benz cats have a lot of platinum in them which is why they are valuable.
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