Fuel trim codes aren't caused by O2 sensor problems! FUEL trim means that the ECU has gone to a max lean OR rich adjustment. ON MB's that is almost always caused by fuel pressure OR incorrect info from air mass sensor or a vacuum leak!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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