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CLK200 error code P0079

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Hi all,

My 2002 W209 CLK200 CGI with M271 1.8 compressor engine is showing P0079. "Exhaust valve-bank 1 Control circuit low"

I have replaced the magnet sensor on exhaust side, and installed the cable extenders that came with the sensor kit. After that, I deleted the codes.

But no, it keeps coming back with the same error code... Engine runs with less power, and will not above 4000rpm. Also smell like rich mixture.

Anyone familier or solved this? Is it caused by oil in the wiring, and if so, will all the wire harness need to be replaced?

I appreciate all kind of advice at this moment.