About 95% of fuel trim codes are related to an air mass sensor that doesn't return the correct info on the amount of air that is going thru the sensor.
The other 5% are either vacuum leaks or the fuel pressure/ regulator.
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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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