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Bob, sounds like he is reading the codes from the fuel system computer!! NOT the diagnostic computer that registers the check engine fault codes. There is a code 31 in the fuel computer & that is for a faulty front O2 sensor. & code 35 means that the fuel system is too lean. HAVE him scan the DM (diagnostic ECU) at pin number 19 to get the correct check engine info!! STILL sounds like a faulty air mass sensor!! VERY easy to install, less than 5 minutes.
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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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