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#1
11-14-2001, 11:51 AM
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How to check mass airflow sensor
Is there anyway to check whether the mass
air flow sensor on a 98 E320 is working correctly. I hate to go out and buy one and found out later it is the O2 sensors that are bad. I have a check engine on and using a OBD II scanner, the code is Trim Fuel malfunction. Thanks 
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#2
11-14-2001, 05:17 PM
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If the codes are P0 170 & OR P0 173 then only fuel pressure, vacuum leaks or air mass sensor will cause this!
If your scanner will allow you to veiw LIVE DATA then you can see air mass values.
__________________
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) Retired Moderator Last edited by mbdoc; 11-14-2001 at 05:29 PM.
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#5
11-15-2001, 08:07 AM
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In actual values look at the partial load correction factor, if the value is above 1.25 then the air mass sensor is to blame.
__________________
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) Retired Moderator
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