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The computer can "adjust" the fuel mixture aprox 30% either direction(rich or lean) from mean value, after that much correction in either direction the check engine lamp comes on. That means the computer can NO longer correct the fuel mixture. Running a engine at the "lean" stop isn't good at highway speed. If they had time to check the car why didn't they install the sensor? Around town should be OK but a TRIP could cause problems.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
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