So my CEL continues to come on and I am continuously getting 11 flashes which everyone has told me is the air injection system. So now how or where do I correct the problem, can someone please point me in the right direction? What part or part number should I look at replacing? I have already replaced the air diverter(?) and the check air valve, both located on the passenger side by the smog/air pump. I feel like I have been chasing my tail with this issue and I am completely lost. Thanks guys!
1990 190E 2.6

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1990 190E 3.0L