The HIGH CO% reading is the real problem. Either the O2 sensor isn't working at all or someone has mis-adjusted the fuel mixture.
Checking the DUTY cycle should reveal the problem!
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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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