My check engine light came on after I replaced my EHA with a used one. My previous EHA was bad and would leak. The one I replaced it with does not leak. I bought 2 used and no matter what one I put on I get the CODE 17. Someone suggested that it might be the O2 sensor itself, so I went out and bought another and put it on seeing how mine was last changed 41k miles ago, but I still get the CODE 17 even with the new O2 sesor. Any suggestions on how to remedy this?

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1990 190E 3.0L